Medium severity · published Apr 10, 2026
CVE-2026-35598
Vikunja has Missing Authorization on CalDAV Task Read
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vikunja · go-vikunja
< 2.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35598
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-35598
Patch
https://github.com/go-vikunja/vikunja/commit/879462d717351fe5d276ddec5246bdec31b41661
Issue Tracking
https://github.com/go-vikunja/vikunja/pull/2579
Release Notes
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
Exploit
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-48ch-p4gq-x46x
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