Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV output generator builds iCalendar VTODO entries via raw string concatenation without applying RFC 5545 TEXT value escaping. User-controlled task titles containing CRLF characters break the iCalendar property boundary, allowing injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER. This vulnerability is fixed in 2.3.0.
Affected products
vikunja: vikunja
References4
- github.com/go-vikunja/vikunja/security/advisories/GHSA-2g7h-7rq… ExploitVendor Advisory
- github.com/go-vikunja/vikunja/security/advisories/GHSA-2g7h-7rq… ExploitVendor Advisory
- github.com/go-vikunja/vikunja/pull/2580 Issue Tracking
- github.com/go-vikunja/vikunja/releases/tag/v2.3.0 Release Notes
Metrics
- CVSS 3.1
-
4.1
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N - EPSS — exploit probability
- 0% percentile: 10 · as of 12 November 2026
- CWE
- CWE-93
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.