CVE-2026-91985

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate privileges and perform unauthorized writes or administrative actions.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Vikunja before 2.6.0 Privilege Escalation via Link Share Hash | Advisories | VulnCheck

https://www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link-share-hash
github Patch Available🟡 PoC Available

Read-only project members can obtain any link share's access hash via the single-share read endpoint (v1 and v2) and escalate to the share's permission level · Advisory · go-vikunja/vikunja · GitHub

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g

Vendor Advisories for CVE-2026-91985(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 28× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 07:06 UTCGHSA enrichment
  2. 2026-09-24 19:52 UTCEG score recompute
  3. 2026-09-24 19:52 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 08:38 UTCGHSA enrichment
  6. 2026-09-23 21:24 UTCEG score recompute
  7. 2026-09-23 21:24 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 10:11 UTCGHSA enrichment
  10. 2026-09-22 22:57 UTCEG score recompute
  11. 2026-09-22 22:57 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 11:42 UTCGHSA enrichment
  14. 2026-09-22 00:29 UTCEG score recompute
  15. 2026-09-22 00:29 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 13:14 UTCGHSA enrichment
  18. 2026-09-21 02:00 UTCEG score recompute
  19. 2026-09-21 02:00 UTCGHSA enrichment
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 14:46 UTCGHSA enrichment
  22. 2026-09-20 03:32 UTCGHSA enrichment
  23. 2026-09-19 16:18 UTCEG score recompute
  24. 2026-09-19 16:18 UTCGHSA enrichment
  25. 2026-09-19 05:04 UTCEG score recompute
Show 18 more
  1. 2026-09-19 05:04 UTCGHSA enrichment
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 17:50 UTCGHSA enrichment
  4. 2026-09-18 06:36 UTCEG score recompute
  5. 2026-09-18 06:36 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 19:22 UTCGHSA enrichment
  8. 2026-09-17 07:13 UTCGHSA enrichment
  9. 2026-09-16 19:57 UTCGHSA enrichment
  10. 2026-09-16 16:00 UTCEG score recompute
  11. 2026-09-16 16:00 UTCGHSA enrichment
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 04:46 UTCEG score recompute
  14. 2026-09-16 04:46 UTCGHSA enrichment
  15. 2026-09-15 17:32 UTCEG score recompute
  16. 2026-09-15 16:18 UTCEG score recompute
  17. 2026-09-15 15:23 UTCEG score recompute
  18. 2026-09-15 15:22 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91985?
CVE-2026-91985 is a high vulnerability published on September 15, 2026. Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate…
When was CVE-2026-91985 disclosed?
CVE-2026-91985 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91985 actively exploited?
CVE-2026-91985 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.2% of all scored CVEs.
What is the CVSS score of CVE-2026-91985?
CVE-2026-91985 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-91985?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91985, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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