Duplicate Advisory: Vikunja: Link-share token can enumerate users through the v2 API
Description
Vikunja versions up to 2.5.0 have a vulnerability in the v2 API where link-share tokens are not properly validated. This allows attackers with read-only share links to enumerate project users and confirm arbitrary usernames via the global search endpoint. The vulnerability has a medium severity rating with a CVSS score of 4.3.
CVSS v3.1
Score 4.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Vikunja before version 2.6.0 fails to properly validate link-share tokens in the v2 API user search endpoints. This flaw enables attackers possessing a read-only share link to enumerate users associated with projects by accessing the projects endpoint and to verify arbitrary usernames through the global search endpoint. This issue is categorized under CWE-200 (Information Exposure).
Potential Impact
An attacker with a read-only share link can enumerate users in projects and confirm the existence of arbitrary usernames. This information disclosure could aid in further targeted attacks or reconnaissance but does not directly impact data integrity or availability.
Mitigation Recommendations
Patch status is not explicitly confirmed in the provided data, but the vulnerability affects Vikunja versions up to 2.5.0 and is fixed in version 2.6.0. Users should upgrade to Vikunja 2.6.0 or later to remediate this issue. No vendor advisory or official patch link is provided, so verify with the vendor for the latest remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-vcgv-7rvm-m3vp
- Osv Schema Version
- 1.4.0
- Ecosystems
- ["Go"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6ac96e462cdf04f65689a68f
Added to database: 10/09/2026, 22:44:22 UTC
Last enriched: 10/09/2026, 22:47:54 UTC
Last updated: 10/09/2026, 22:47:54 UTC
Views: 6
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