CVE-2026-80349

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-23. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated

Also known asEUVD-2026-66388 (ENISA EUVD) · GHSA-2h2x-v86q-mgw5 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's CNA (VulnCheck) lists TarsCloud TarsWeb versions up to and including 3.0.14 as affected. No release containing a fix is confirmed on record.

TarsWeb decides whether a request comes from a trusted local caller using a client-controlled header. app.js sets Koa's proxy option to true without naming which upstream proxies may be trusted and without limiting the number of forwarded hops, so the request address Koa reports is taken from the X-Forwarded-For header supplied by the caller. In midware/ssoMidware.js a single branch covers both the ignored-path list and the ignoreIps allowlist from config/loginConf.js, which contains the loopback address, and that branch assigns the effective account identity from the uid query parameter before falling through to the request without validating any ticket, cookie or password. A request carrying a forged X-Forwarded-For value naming the loopback address and a uid naming an existing account therefore reaches every route the console mounts as that account, including an administrator, with no credential of any kind. Those routes include user and role administration, service configuration, and package upload and deployment. Version 3.0.16 separates the two branches so that a match on the address allowlist assigns the configured default account rather than one named by the caller.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 26, 2026

Last Modified

September 23, 2026

Advisory Details (5)

Auto-updated Nov 8, 2026
No fix on record yet.
Web page

Unauthenticated admin impersonation via spoofed X-Forwarded-For in tars-web session middleware · Issue #212 · TarsCloud/TarsWeb · GitHub

https://github.com/TarsCloud/TarsWeb/issues/212
Web page

TarsWeb through 3.0.14 Authentication Bypass via Spoofed X-Forwarded-For and uid Parameter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/tarsweb-through-3.0.14-authentication-bypass-via-spoofed-x-forwarded-for-and-uid-parameter
Web page

TarsWeb/midware/ssoMidware.js at v3.0.14 · TarsCloud/TarsWeb · GitHub

https://github.com/TarsCloud/TarsWeb/blob/v3.0.14/midware/ssoMidware.js
Web page

TarsWeb/app.js at v3.0.14 · TarsCloud/TarsWeb · GitHub

https://github.com/TarsCloud/TarsWeb/blob/v3.0.14/app.js
Web page

GitHub - TarsCloud/TarsWeb: TARS Projects Dashboard · GitHub

https://github.com/TarsCloud/TarsWeb

Vendor Advisories for CVE-2026-80349(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 62× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 259 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 159 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 13:25 UTCEchelonGraph re-scored
  2. 2026-11-13 13:25 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  4. 2026-11-12 14:44 UTCEchelonGraph re-scored
  5. 2026-11-12 14:44 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  7. 2026-11-11 16:08 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-11-10 17:28 UTCEchelonGraph re-scored
  9. 2026-11-10 17:28 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  11. 2026-11-09 18:51 UTCEchelonGraph re-scored
  12. 2026-11-09 18:51 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  14. 2026-11-08 20:15 UTCEchelonGraph re-scored
  15. 2026-11-08 20:15 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-11-07 21:39 UTCEchelonGraph re-scored
  18. 2026-11-07 21:39 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-11-06 23:03 UTCEchelonGraph re-scored
  21. 2026-11-06 23:03 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-11-06 19:25 UTCOSV refresh
  23. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  24. 2026-11-06 00:27 UTCEchelonGraph re-scored
  25. 2026-11-06 00:27 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
Show 75 more
  1. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-11-05 01:51 UTCEchelonGraph re-scored
  3. 2026-11-05 01:51 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  5. 2026-11-04 03:15 UTCEchelonGraph re-scored
  6. 2026-11-04 03:15 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  8. 2026-11-03 04:39 UTCEchelonGraph re-scored
  9. 2026-11-03 04:39 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  11. 2026-11-02 05:55 UTCEchelonGraph re-scored
  12. 2026-11-02 05:55 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  14. 2026-11-01 07:18 UTCEchelonGraph re-scored
  15. 2026-11-01 07:18 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-10-31 08:42 UTCEchelonGraph re-scored
  18. 2026-10-31 08:42 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-10-30 10:06 UTCEchelonGraph re-scored
  21. 2026-10-30 10:06 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-10-29 11:29 UTCEchelonGraph re-scored
  24. 2026-10-29 11:29 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  26. 2026-10-28 12:53 UTCEchelonGraph re-scored
  27. 2026-10-28 12:53 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  28. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  29. 2026-10-27 14:17 UTCEchelonGraph re-scored
  30. 2026-10-27 14:17 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  31. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  32. 2026-10-26 15:18 UTCEchelonGraph re-scored
  33. 2026-10-26 15:18 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  34. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  35. 2026-10-25 15:46 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  36. 2026-10-25 13:59 UTCEchelonGraph re-scored
  37. 2026-10-24 17:10 UTCEchelonGraph re-scored
  38. 2026-10-24 17:10 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  40. 2026-10-23 18:34 UTCEchelonGraph re-scored
  41. 2026-10-23 18:34 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  43. 2026-10-23 00:27 UTCEchelonGraph re-scored
  44. 2026-10-23 00:27 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  45. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  46. 2026-10-22 01:38 UTCEchelonGraph re-scored
  47. 2026-10-22 01:38 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  49. 2026-10-21 03:01 UTCEchelonGraph re-scored
  50. 2026-10-21 03:01 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  51. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  52. 2026-10-20 04:15 UTCEchelonGraph re-scored
  53. 2026-10-20 04:14 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  55. 2026-10-19 05:03 UTCEchelonGraph re-scored
  56. 2026-10-19 05:03 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-10-18 06:26 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-10-18 03:10 UTCEchelonGraph re-scored
  59. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  60. 2026-10-17 06:04 UTCEchelonGraph re-scored
  61. 2026-10-17 06:04 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  63. 2026-10-16 07:11 UTCEchelonGraph re-scored
  64. 2026-10-16 07:10 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  65. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  66. 2026-10-15 05:59 UTCEchelonGraph re-scored
  67. 2026-10-15 05:59 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  69. 2026-10-14 01:37 UTCEchelonGraph re-scored
  70. 2026-10-14 01:37 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  72. 2026-10-12 21:47 UTCEchelonGraph re-scored
  73. 2026-10-12 21:47 UTCGHSA enrichmentGHSA-2h2x-v86q-mgw5 · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  75. 2026-10-12 14:57 UTCEchelonGraph re-scored

Frequently asked(5)

What is CVE-2026-80349?
CVE-2026-80349 is a critical-severity vulnerability; its CVE record was published on August 26, 2026. TarsWeb decides whether a request comes from a trusted local caller using a client-controlled header. app.js sets Koa's proxy option to true without naming which upstream proxies may be trusted and without limiting the number of forwarded hops, so the request address Koa reports is taken from the…
When was CVE-2026-80349 made public?
CVE-2026-80349 was made public on August 26, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 26, 2026. EchelonGraph's copy of the record carries a last-modified date of September 23, 2026; the record at its source may have been updated since.
Is CVE-2026-80349 actively exploited?
CVE-2026-80349 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-80349?
CVE-2026-80349 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-80349?
No fix for CVE-2026-80349 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (VulnCheck) lists TarsCloud TarsWeb versions up to and including 3.0.14 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-80349 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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