Vulnerability in Go-Vikunja Vikunja
CVE-2026-35601
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.
Vulnerability class: CRLF Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Go-Vikunja Vikunja — versions < 2.3.0
- Vikunja
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-2g7h-7rqr-9p4r (Exploit, Vendor Advisory)
- github.com/go-vikunja/vikunja/pull/2580 (Issue Tracking)
- github.com/go-vikunja/vikunja/releases/tag/v2.3.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-35601?
- CVE-2026-35601 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under CRLF Injection. CVSS score: 4.1/10. Published 2026-04-10.
- How severe is CVE-2026-35601?
- Medium severity. CVSS v3 base score is 4.1 out of 10.