CVE-2026-111921: Incorrect Authorization in go-vikunja vikunja
Description
Vikunja versions from 0.13.0 up to but not including 2.7.0 have an incorrect authorization vulnerability. This flaw allows project members with Write permission to delete admin-level link shares due to improper permission checks on share deletion. Attackers can exploit this by sending DELETE requests with sequential share IDs to revoke admin shares and invalidate share sessions.
CVSS v4.0
Score 5.3medium
Affected software
go-vikunja
vikunja
pkg:golang/github.com/go-vikunja/vikunjaRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-111921 describes an incorrect authorization vulnerability in Vikunja versions >=0.13.0 and <2.7.0. The vulnerability arises because the delete permission check reads an unloaded share object, permitting project members with Write permission to delete admin-tier link shares. Exploitation involves sending DELETE requests to the v1 or v2 project shares endpoints with sequential share IDs, enabling attackers to revoke admin links and invalidate existing share sessions.
Potential Impact
Attackers with Write permission on a project can revoke admin-level link shares, potentially disrupting administrative access and invalidating existing share sessions. This could lead to denial of access for legitimate admin users relying on those shares. The CVSS score of 5.3 (medium severity) reflects the moderate impact and ease of exploitation without user interaction.
Mitigation Recommendations
No explicit patch or remediation information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict Write permissions carefully and monitor share deletion activities.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-17T12:19:42.358Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad3c6d42cdf04f65652081b
Added to database: 10/17/2026, 19:04:52 UTC
Last enriched: 10/17/2026, 19:18:42 UTC
Last updated: 10/17/2026, 19:19:31 UTC
Views: 3
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