CVE-2026-91985CWE-200information-disclosure

CVE-2026-91985

High · published September 15, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
36.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00432 · 36.5th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-09-15T20:17Z
References (3)
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g · [email protected]https://www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link-share-hash · [email protected]https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 15:18Z
    Vikunja before 2.6.0 Privilege Escalation via Link Share Hash
    cvelistv5