CVE-2026-91984CWE-639

CVE-2026-91984

Medium · published September 15, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
17.3
In the wild
Unconfirmed
What it is

Vikunja before 2.6.0 fails to validate that user-supplied project_view_id in task-position requests belongs to the task's project. Authenticated attackers can insert task position rows into arbitrary other tenant project views via POST or PUT task-position endpoints.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00264 · 17.3th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-09-15T20:17Z
References (2)
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w39f-h553-h2mx · [email protected]https://www.vulncheck.com/advisories/vikunja-before-2.6.0-broken-object-level-authorization-via-task-position · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 15:18Z
    Vikunja before 2.6.0 Broken Object-Level Authorization via task-position
    cvelistv5