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VulnerabilityPublished Updated

CVE-2026-35601: vikunja · CRLF Injection

Affects vikunjaSource CVE Database V5

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Not known to be exploited · CVSS 4.1 Medium : upgrade to 2.3.0 when convenient.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
4.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.3.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade vikunja and github.com/go-vikunja/vikunja to 2.3.0.

Affected software

ProductAffectedFixed in
go-vikunjavikunjaAffected
  • <2.3.0
Fixed in
  • 2.3.0
Gogithub.com/go-vikunja/vikunjapkg:golang/github.com/go-vikunja/vikunjaOther threatsAffected
  • <2.3.0
Fixed in
  • 2.3.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to Vikunja version 2.3.0 or later, where this vulnerability is fixed by proper escaping of iCalendar TEXT values. Since the vendor advisory confirms the fix in 2.3.0, applying this official update fully mitigates the issue.

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.

References

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