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CVE-2026-35601

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

Published: Apr 10, 2026Updated: Apr 10, 2026 Sources: CVE List
NVD MITRE
4.1CVSS
MEDIUM

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.

EPSS Score
0.0%
Top 91.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None

Weaknesses

CWE-93CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')

Affected Products

vikunja
go-vikunja

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-2g7h-7rqr-9p4r
github.com
https://github.com/go-vikunja/vikunja/pull/2580
github.com
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
github.com

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