CVE-2026-68581

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

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

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-10-09. A secondary CVSS source baseline 8.1; sources differ by 0.0.

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

Also known asEUVD-2026-51991 (ENISA EUVD) · GHSA-9jrx-vmh8-c6xw (GitHub Security Advisories) · GHSA-vvcv-vpph-h844 (GitHub Security Advisories) · GO-2026-6753 (OSV.dev)Source: ENISA EUVD

8.1EG
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).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.1Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Vikunja versions 0.22.0 through 2.3.0 fail to validate the principal type in API token management. Because user IDs and link-share IDs are independent numeric sequences and both resolve through a generic web.Auth.GetID() interface, a link-share JWT whose numeric ID equals a target user's ID is treated as that user by the /api/v1/tokens endpoints. An authenticated attacker can obtain a target's numeric user ID via authenticated user search, then create link shares on an attacker-writable project until the link-share sequence reaches that value, and use the resulting link-share JWT to list, create, and delete the target user's API tokens (including issuing a new token with attacker-chosen scopes under the target's permissions). Fixed in version 2.4.0.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
52
EG Risk 52/100

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)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 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.
Automatability0% × 15%
CISA's SSVC Automatable value: no (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 no (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: 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
0.5%
EPSS %ILE
40th
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 (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-08). 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: 14 days if the affected system is publicly exposed; Fix on system upgrade 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, Track* at medium and Attend at high mission impact.

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

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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 2, 2026

Last Modified

October 23, 2026

Advisory Details (4)

Auto-updated Aug 2, 2026
Patch available. Sources: github_commit, github.
Web pageMentions a patch (unverified)

Vikunja 0.22.0 through 2.3.0 Authentication Bypass via Principal ID Collision | Advisories | VulnCheck

https://www.vulncheck.com/advisories/vikunja-through-authentication-bypass-via-principal-id-collision
GitHub commit

commit 95b7e673fb5e (go-vikunja/vikunja)

Fix landed in go-vikunja/vikunja commit 95b7e673fb5e — awaiting tagged release

https://github.com/go-vikunja/vikunja/commit/95b7e673fb5ee407498fa4b13e8b4c57847a4a0b
GitHub commit

commit e6b25bd57b53 (go-vikunja/vikunja)

Fix landed in go-vikunja/vikunja commit e6b25bd57b53 — awaiting tagged release

https://github.com/go-vikunja/vikunja/commit/e6b25bd57b537ef9a72b5acdadf446ca5ef77bfa
GitHub advisoryMentions a patch (unverified)

Link-share principal ID collision allows cross-account API token issuance and management · Advisory · go-vikunja/vikunja · GitHub

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vvcv-vpph-h844

Vendor Advisories for CVE-2026-68581(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
gocode.vikunja.io/api @ 2.4.0 (fixes >= 0.22.0, <= 2.3.0)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
code.vikunja.io/api—
  • 0.22.0 up to 2.4.0: fixed in 2.4.0
  • 0.22.0 on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 33× 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 268 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 168 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-11-08 20:44 UTCEchelonGraph re-scored
  6. 2026-11-08 20:44 UTCGHSA enrichmentGHSA-vvcv-vpph-h844 · GitHub severity HIGH · GitHub CVSS 8.1
  7. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-11-03 15:03 UTCEchelonGraph re-scored
  14. 2026-11-03 15:03 UTCGHSA enrichmentGHSA-vvcv-vpph-h844 · GitHub severity HIGH · GitHub CVSS 8.1
  15. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-11-01 07:40 UTCGHSA enrichmentGHSA-vvcv-vpph-h844 · GitHub severity HIGH · GitHub CVSS 8.1
  18. 2026-11-01 07:40 UTCEchelonGraph re-scored
  19. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-10-27 21:07 UTCEchelonGraph re-scored
  24. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 75 more
  1. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-10-25 14:09 UTCEchelonGraph re-scored
  3. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-10-23 22:29 UTCEchelonGraph re-scored
  5. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-10-20 09:00 UTCEchelonGraph re-scored
  10. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-10-18 03:19 UTCEchelonGraph re-scored
  13. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  16. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  17. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-10-13 10:03 UTCEchelonGraph re-scored
  19. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-10-12 15:45 UTCEchelonGraph re-scored
  21. 2026-10-11 19:30 UTCEchelonGraph re-scored
  22. 2026-10-11 16:45 UTCEchelonGraph re-scored
  23. 2026-10-11 14:06 UTCEchelonGraph re-scored
  24. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  25. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  26. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  27. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  28. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  29. 2026-10-06 23:48 UTCEchelonGraph re-scored
  30. 2026-10-06 23:48 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  31. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  32. 2026-10-05 19:51 UTCEchelonGraph re-scored
  33. 2026-10-05 19:51 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  34. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  35. 2026-10-04 23:47 UTCEchelonGraph re-scored
  36. 2026-10-04 23:47 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  37. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  38. 2026-10-04 06:23 UTCEchelonGraph re-scored
  39. 2026-10-04 06:23 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  40. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  41. 2026-10-03 02:42 UTCEchelonGraph re-scored
  42. 2026-10-03 02:42 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  43. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  44. 2026-10-02 10:26 UTCEchelonGraph re-scored
  45. 2026-10-02 10:26 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  46. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  47. 2026-10-01 15:41 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  48. 2026-10-01 02:40 UTCEchelonGraph re-scored
  49. 2026-10-01 02:40 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  50. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  51. 2026-09-29 06:45 UTCEchelonGraph re-scored
  52. 2026-09-29 06:45 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  53. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  54. 2026-09-28 07:08 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  55. 2026-09-27 18:20 UTCEchelonGraph re-scored
  56. 2026-09-27 18:20 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  57. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  58. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  59. 2026-09-25 04:49 UTCEchelonGraph re-scored
  60. 2026-09-25 04:49 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  61. 2026-09-24 12:52 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  62. 2026-09-23 23:49 UTCEchelonGraph re-scored
  63. 2026-09-23 23:49 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  64. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  65. 2026-09-23 10:17 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  66. 2026-09-22 21:31 UTCEchelonGraph re-scored
  67. 2026-09-22 21:31 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  68. 2026-09-22 06:50 UTCEchelonGraph re-scored
  69. 2026-09-22 06:50 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  70. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  71. 2026-09-20 20:58 UTCEchelonGraph re-scored
  72. 2026-09-20 20:58 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1
  73. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  74. 2026-09-19 23:30 UTCEchelonGraph re-scored
  75. 2026-09-19 23:30 UTCGHSA enrichmentGHSA-9jrx-vmh8-c6xw · GitHub severity HIGH · GitHub CVSS 8.1

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-68581?
CVE-2026-68581 is a high-severity vulnerability; its CVE record was published on August 2, 2026. Vikunja versions 0.22.0 through 2.3.0 fail to validate the principal type in API token management. Because user IDs and link-share IDs are independent numeric sequences and both resolve through a generic web.Auth.GetID() interface, a link-share JWT whose numeric ID equals a target user's ID is…
When was CVE-2026-68581 made public?
CVE-2026-68581 was made public on July 19, 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 2, 2026. EchelonGraph's copy of the record carries a last-modified date of October 23, 2026; the record at its source may have been updated since.
Is CVE-2026-68581 actively exploited?
CVE-2026-68581 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-68581?
CVE-2026-68581 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-68581?
A fix for CVE-2026-68581 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-68581 are linked in the Vendor Advisories panel on this page.

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