CVE-2026-33335

Q: How do I fix CVE-2026-33335?

Upgrade vikunja to 2.2.2 or later.

Q: Is CVE-2026-33335 being actively exploited?

Not that we know of. CVE-2026-33335 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.25% is the estimated probability that it will be exploited in the next 30 days. That is higher than 16% of all scored CVEs.

Q: How severe is CVE-2026-33335?

CVE-2026-33335 has a CVSS v3 base score of 8.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-33335 affect?

Published advisories record a fix for vikunja (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

8.0

CVSS v3

NVD

Description

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 open arbitrary URI schemes, invoking local applications, opening local files, or triggering custom protocol handlers. Version 2.2.0 patches the issue.

CWE-939

How to fix

Remediation Available

vikunjaNVD

Affected:>= 0.21.0, < 2.2.2Fixed in:2.2.2CVE-2026-33335derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

0.25%probability of exploitation in 30 days

16thpercentile

Low risk: more likely to be exploited than 16% of all known CVEs.

References

Exploit1

github.com

Release Notes1

vikunja.io

Related Vulnerabilities

Other CWE-939 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11000	Medium	5.7	1.2%	-	Fix
CVE-2021-31384	High	7.2	1.1%	-	-
CVE-2022-20736	Medium	5.3	1.0%	-	Fix
CVE-2023-43582	Medium	5.5	0.7%	-	Fix
CVE-2026-26123	High	5.5	0.6%	-	Fix
CVE-2024-33606	High	8.8	0.5%	-	Fix

Common questions

How do I fix CVE-2026-33335?

Upgrade vikunja to 2.2.2 or later.

Is CVE-2026-33335 being actively exploited?

Not that we know of. CVE-2026-33335 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.25% is the estimated probability that it will be exploited in the next 30 days. That is higher than 16% of all scored CVEs.

How severe is CVE-2026-33335?

CVE-2026-33335 has a CVSS v3 base score of 8.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-33335 affect?

Published advisories record a fix for vikunja (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-33335

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-27.