CVE-2026-35601: Vikunja is an open-source self-hosted task management platform

Q: How do I fix CVE-2026-35601?

vikunja: upgrade to 2.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-35601 being exploited?

CVE-2026-35601 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35601 affect?

CVE-2026-35601 affects vikunja. Severity is medium (CVSS 4.1). 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 titl

Q: How urgent is CVE-2026-35601?

Priority 22/100. Public exploit reference

Routine

MEDIUM 4.1UPGRADE

CVE-2026-35601 is a medium-severity flaw (CVSS 4.1) affecting vikunja. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-93
Published	2026-04-10
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: vikunja

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-10 17:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

vikunja vikunja UPGRADE

Affected: < 2.3.0

Fixed in: 2.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy vikunja || rpm -q vikunja || vikunja --version

2. UPGRADE to 2.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vikunja

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vikunja

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35601?

vikunja: upgrade to 2.3.0. Exact commands for each OS are on this page.

Is CVE-2026-35601 being exploited?

CVE-2026-35601 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35601 affect?

CVE-2026-35601 affects vikunja. Severity is medium (CVSS 4.1). 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 titl

How urgent is CVE-2026-35601?

Priority 22/100. Public exploit reference

Related CVEs

CVE-2026-35597 MEDIUM 5.9 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35596 MEDIUM 4.3 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35594 MEDIUM 6.5 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35595 HIGH 8.3 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35599 MEDIUM 6.5 UPGRADE Vikunja is an open-source self-hosted task management platform

References

← Back to latest CVEs