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CVE-2026-35601

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

Published: Apr 10, 2026Updated: Apr 17, 2026 Sources: CVE List NVDCWE-93
NVD MITRE
4.1CVSSMEDIUM
EPSS Score
0.2%
Top 90.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

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
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Weaknesses

CWE-93

Affected Products

vikunjavikunja
On-prem
Enterprise Software / collaboration-groupware
vikunjago-vikunja
On-prem
Cloud & SaaS / saas-application
vikunjaoss-projectEnterprise Software
go-vikunjaoss-projectCloud & SaaSaka vikunja

Exploitability

Official Patch Available

References

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

Timeline

Published
Apr 10, 2026
Last Updated
Apr 17, 2026

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