CVE-2026-111918CWE-863broken-access-control

CVE-2026-111918

Medium · published October 17, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
6.8
In the wild
Unconfirmed
What it is

Vikunja from 1.0.0-rc0 before 2.7.0 contains an improper authorization vulnerability in RecalculateTaskPositions that allows authenticated users with zero accessible projects to write task_positions rows for all tasks instance-wide. Attackers can delete their Inbox after repointing default_project_id, then create empty-filter saved filters to persist cross-tenant references and amplify writes for denial of service.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
EPSS
0.00176 · 6.8th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-10-17T23:16Z
References (2)
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fprf-r6rv-xg99 · [email protected]https://www.vulncheck.com/advisories/vikunja-1.0.0-rc0-before-2.7.0-cross-tenant-task-position-writes-via-saved-filter-creation · [email protected]
EPSS history
Timeline
  • 19 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 17 OCT 18:46Z
    Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation
    cvelistv5
  • 17 OCT 18:46Z
    Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation
    cvelistv5