Duplicate Advisory: Vikunja: API token scopes bypassed via task expand parameter (comments, reactions, time entry counts)
Description
Vikunja versions 1.0.0 through 2.5.0 have an API token scope bypass vulnerability in task read endpoints. The issue arises because the authorization process does not properly inspect the 'expand' query parameter, allowing attackers with limited token scopes to access restricted data such as comments, reactions, and time entry counts without proper permission checks. This 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 contains a vulnerability where API token scope enforcement is bypassed in task read endpoints. Specifically, the authorization mechanism fails to validate the 'expand' query string parameter, enabling attackers holding tokens with limited scopes to retrieve additional restricted information like comments, reactions, and time entries. This flaw corresponds to CWE-863 (Incorrect Authorization). The vulnerability affects versions from 1.0.0 up to and including 2.5.0.
Potential Impact
Attackers with limited API token scopes can exploit this vulnerability to access restricted task-related data such as comments, reactions, and time entry counts without proper authorization. The confidentiality of this data is impacted, but there is no indication of integrity or availability impact. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the advisory is marked as a duplicate and no patch links are provided, users should verify if version 2.6.0 or later is available and upgrade accordingly to mitigate this vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-phph-c358-5mwm
- Osv Schema Version
- 1.4.0
- Ecosystems
- ["Go"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6ac96e4c2cdf04f65689a6c0
Added to database: 10/09/2026, 22:44:28 UTC
Last enriched: 10/09/2026, 22:48:32 UTC
Last updated: 10/09/2026, 22:48:32 UTC
Views: 1
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