CVE-2026-35601

Vikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output

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

go-vikunja · vikunja

CVSS v3.1 GITHUB

4.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

EPSS

0.32% chance of exploitation in the next 30 days, 24th percentile

Published

2026-04-10

Updated

2026-04-13

Proof-of-concept exploits (1)

• advisories/GHSA-2g7h-7rqr-9p4r

Security advisories

• go-vikunja/vikunja/security/advisories/GHSA-2g7h-7rqr-9p4r
• go-vikunja/vikunja/pull/2580

References

• CVE Record
• NVD entry