Is CVE-2026-33335 in the CISA KEV catalog?

No. CVE-2026-33335 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-33335?

CVE-2026-33335 has a CVSS v3 base score of 8.0 (HIGH).

What is the EPSS score for CVE-2026-33335?

CVE-2026-33335 has an EPSS score of 0.25% (16th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-33335?

Upgrade vikunja to 2.2.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-33335

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

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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.