CVE-2026-33335: Vikunja is an open-source self-hosted task management platform

Routine

HIGH 8.0UPGRADE

CVE-2026-33335 is a high-severity flaw (CVSS 8.0) 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. Starting in version 0.21.0 and prior to version 2.2.0, the Vikunja Desktop Electron wrapper passes URLs from `window.open()` calls directly to `shell.openExternal()` without any validation or protocol allowlisting. An attacker who can place a link with `target="_blank"` (or that otherwise triggers `window.open`) in user-generated content can cause the victim's operating system to ope

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-939
Published	2026-03-24
Last modified	2026-06-17

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

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 16:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

vikunja vikunja UPGRADE

Affected: >= 0.21.0 and < 2.2.2

Fixed in: 2.2.2

Safe to downgrade to: a release before 0.21.0

1. Check installed version

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

2. UPGRADE to 2.2.2 (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.

3. If no update is available yet, DOWNGRADE to a release before 0.21.0 (Debian / Ubuntu)

apt-cache madison vikunja sudo apt install vikunja=<VERSION_BEFORE_0.21.0> sudo apt-mark hold vikunja

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list vikunja sudo dnf downgrade vikunja-<VERSION_BEFORE_0.21.0> sudo dnf versionlock add vikunja

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-33335?

vikunja: upgrade to 2.2.2. Exact commands for each OS are on this page.

Is CVE-2026-33335 being exploited?

CVE-2026-33335 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-2026-33335 affect?

CVE-2026-33335 affects vikunja. Severity is high (CVSS 8.0). Vikunja is an open-source self-hosted task management platform. Starting in version 0.21.0 and prior to version 2.2.0, the Vikunja Desktop Electron wrapper passes URLs from `window.open()` calls directly to `shell.openExternal()` without an

How urgent is CVE-2026-33335?

Priority 37/100. High severity; Public exploit reference

Software pages

Electron vulnerabilities

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

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