CVE-2026-35598: CWE-862: Missing Authorization in go-vikunja vikunja
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. This vulnerability is fixed in 2.3.0.
AI Analysis
Technical Summary
The vulnerability in go-vikunja's vikunja product (CVE-2026-35598) involves missing authorization checks in the CalDAV GetResource and GetResourcesByList methods prior to version 2.3.0. These methods fetch tasks by UID from the database without verifying that the authenticated user has access rights to the task's project. As a result, any authenticated CalDAV user who knows or can guess a task UID can read the full task data from any project on the instance. The issue is classified under CWE-862 (Missing Authorization).
Potential Impact
An authenticated CalDAV user can read task data from projects they are not authorized to access, potentially exposing sensitive task information. The vulnerability does not allow modification or denial of service, only unauthorized read access. The CVSS score of 4.3 reflects a medium impact primarily on confidentiality.
Mitigation Recommendations
Upgrade vikunja to version 2.3.0 or later, where this authorization issue is fixed. No official patch link is provided, but the vendor advisory confirms the fix in 2.3.0. Until upgraded, restrict CalDAV user access to trusted users only to reduce risk.
CVE-2026-35598: CWE-862: Missing Authorization in go-vikunja vikunja
Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. This vulnerability is fixed in 2.3.0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in go-vikunja's vikunja product (CVE-2026-35598) involves missing authorization checks in the CalDAV GetResource and GetResourcesByList methods prior to version 2.3.0. These methods fetch tasks by UID from the database without verifying that the authenticated user has access rights to the task's project. As a result, any authenticated CalDAV user who knows or can guess a task UID can read the full task data from any project on the instance. The issue is classified under CWE-862 (Missing Authorization).
Potential Impact
An authenticated CalDAV user can read task data from projects they are not authorized to access, potentially exposing sensitive task information. The vulnerability does not allow modification or denial of service, only unauthorized read access. The CVSS score of 4.3 reflects a medium impact primarily on confidentiality.
Mitigation Recommendations
Upgrade vikunja to version 2.3.0 or later, where this authorization issue is fixed. No official patch link is provided, but the vendor advisory confirms the fix in 2.3.0. Until upgraded, restrict CalDAV user access to trusted users only to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-03T21:25:12.162Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d9d9751cc7ad14da3f872f
Added to database: 4/11/2026, 5:17:41 AM
Last enriched: 4/11/2026, 5:19:32 AM
Last updated: 4/11/2026, 2:01:57 PM
Views: 7
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