Medium severity · published Apr 10, 2026
CVE-2026-35601
Vikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output
4.1
CVSS
0.2%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vikunja · go-vikunja
< 2.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35601
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-35601
Issue Tracking
https://github.com/go-vikunja/vikunja/pull/2580
Release Notes
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
Exploit
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-2g7h-7rqr-9p4r
More from vikunja
9.8
CVE-2026-28268
Vikunja Vulnerable to Account Takeover via Password Reset Token Reuse
9.6
CVE-2026-33334
Vikunja Desktop: Any frontend XSS escalates to Remote Code Execution due to nodeIntegration
9.1
CVE-2026-34727
Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path
9.1
CVE-2026-27575
Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change
8.8
CVE-2026-33336
Vikunja Desktop vulnerable to Remote Code Execution via same-window navigation