CVE-2026-55094

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (37th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-90208 (ENISA EUVD) · GHSA-v484-996h-6h4h (GitHub Security Advisories)Source: ENISA EUVD

8.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Taskcluster is the task execution framework that supports Mozilla's continuous integration and release processes. Prior to version 100.3.0, Taskcluster is vulnerable to unauthenticated RCE on Taskcluster deployments with an anonymous role that exposes the GraphQL endpoint and parses filter arguments using the sift library. This issue has been patched in version 100.3.0.

CVSS
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
54
EG Risk 54/100

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)
Severity87% × 45%
Impact severity (EG Severity): CVSS 8.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
37th
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 (8.7): severity, escalated by confirmed exploitation. This CVE's 8.7 is its impact severity (EG Severity), not escalated.

EG Severity
8.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-10). 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 or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.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 or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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

September 30, 2026

Last Modified

September 30, 2026

Advisory Details (6)

Auto-updated Sep 30, 2026
Patch available. Sources: github_pr, github_commit, github_release, github.
GitHub release Patch Available

v100.3.0

Patch available: taskcluster/taskcluster v100.3.0

https://github.com/taskcluster/taskcluster/releases/tag/v100.3.0
GitHub commit

commit a1b0154b8235 (taskcluster/taskcluster)

Fix landed in taskcluster/taskcluster commit a1b0154b8235 — awaiting tagged release

https://github.com/taskcluster/taskcluster/commit/a1b0154b8235937657c2ded127f193b564e2334b
GitHub pull request

feat(ui,web): Remove sift dependency and simplify filtering

Fix merged in taskcluster/taskcluster PR #8718 on 2026-06-09 — awaiting tagged release

https://github.com/taskcluster/taskcluster/pull/8718
Web page

Simplify web-server filtering - remove sift library · Issue #8716 · taskcluster/taskcluster · GitHub

https://github.com/taskcluster/taskcluster/issues/8716
GitHub advisoryMentions a patch (unverified)

Unauthenticated remote code execution in Taskcluster web-server via sift library · Advisory · taskcluster/taskcluster · GitHub

https://github.com/taskcluster/taskcluster/security/advisories/GHSA-ccv5-c45x-2q38

Vendor Advisories for CVE-2026-55094(1)

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

Weakness Classification(5)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 35× 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 → 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.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-11-11 03:54 UTCEchelonGraph re-scored
  4. 2026-11-11 03:54 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  5. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  6. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  7. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-11-03 20:18 UTCEchelonGraph re-scored
  13. 2026-11-03 20:18 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  14. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  18. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  20. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-10-27 21:02 UTCEchelonGraph re-scored
  22. 2026-10-27 21:02 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  23. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
Show 72 more
  1. 2026-10-25 14:19 UTCEchelonGraph re-scored
  2. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-20 19:03 UTCEchelonGraph re-scored
  7. 2026-10-20 19:03 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  8. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-18 03:30 UTCEchelonGraph re-scored
  12. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-17 03:34 UTCEchelonGraph re-scored
  14. 2026-10-17 03:34 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  15. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  17. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  19. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  20. 2026-10-12 15:56 UTCEchelonGraph re-scored
  21. 2026-10-11 19:39 UTCEchelonGraph re-scored
  22. 2026-10-11 18:53 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  23. 2026-10-11 16:54 UTCEchelonGraph re-scored
  24. 2026-10-11 14:17 UTCEchelonGraph re-scored
  25. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  26. 2026-10-11 05:45 UTCEchelonGraph re-scored
  27. 2026-10-11 05:45 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  28. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  29. 2026-10-10 16:38 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  30. 2026-10-10 03:30 UTCEchelonGraph re-scored
  31. 2026-10-10 03:29 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  32. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  33. 2026-10-09 14:21 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  34. 2026-10-09 01:10 UTCEchelonGraph re-scored
  35. 2026-10-09 01:10 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  36. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  37. 2026-10-08 12:03 UTCEchelonGraph re-scored
  38. 2026-10-08 12:03 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  39. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  40. 2026-10-07 22:56 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  41. 2026-10-07 09:49 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  42. 2026-10-06 20:42 UTCEchelonGraph re-scored
  43. 2026-10-06 20:42 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  44. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  45. 2026-10-06 07:35 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  46. 2026-10-05 18:28 UTCEchelonGraph re-scored
  47. 2026-10-05 18:28 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  48. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  49. 2026-10-05 05:22 UTCEchelonGraph re-scored
  50. 2026-10-05 05:22 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  51. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  52. 2026-10-04 16:15 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  53. 2026-10-04 03:07 UTCEchelonGraph re-scored
  54. 2026-10-04 03:07 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  55. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  56. 2026-10-03 14:01 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  57. 2026-10-03 00:53 UTCEchelonGraph re-scored
  58. 2026-10-03 00:53 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  59. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  60. 2026-10-02 11:46 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  61. 2026-10-01 22:37 UTCEchelonGraph re-scored
  62. 2026-10-01 22:37 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  63. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  64. 2026-10-01 09:29 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  65. 2026-09-30 20:22 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  66. 2026-09-30 20:01 UTCEchelonGraph re-scored
  67. 2026-09-30 20:01 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  68. 2026-09-30 19:26 UTCEchelonGraph re-scored
  69. 2026-09-30 19:26 UTCGHSA enrichmentGHSA-v484-996h-6h4h · GitHub severity HIGH
  70. 2026-09-30 18:25 UTCEchelonGraph re-scored
  71. 2026-09-30 17:36 UTCEchelonGraph re-scoredFirst assessed: 8.7 HIGH
  72. 2026-09-30 17:35 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-55094?
CVE-2026-55094 is a high-severity vulnerability; its CVE record was published on September 30, 2026. Taskcluster is the task execution framework that supports Mozilla's continuous integration and release processes. Prior to version 100.3.0, Taskcluster is vulnerable to unauthenticated RCE on Taskcluster deployments with an anonymous role that exposes the GraphQL endpoint and parses filter…
When was the CVE record for CVE-2026-55094 published?
The CVE record for CVE-2026-55094 was published on September 30, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 30, 2026; the record at its source may have been updated since.
Is CVE-2026-55094 actively exploited?
CVE-2026-55094 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55094?
CVE-2026-55094 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55094?
A fix for CVE-2026-55094 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55094 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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