Vulnerability · Published Feb 25, 2026 · Assigned by GitHub_M

CVE-2026-27116Vikunja has Reflected HTML Injection via filter Parameter in Projects Module

Medium 6.1

In plain English

A medium-severity cross-site scripting in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 82.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Vikunja is an open-source self-hosted task management platform. Prior to version 2.0.0, a reflected HTML injection vulnerability exists in the Projects module where the `filter` URL parameter is rendered into the DOM without output encoding when the user clicks "Filter." While `<script>` and `<iframe>` are blocked, `<svg>`, `<a>`, and formatting tags (`<h1>`, `<b>`, `<u>`) render without restriction — enabling SVG-based phishing buttons, external redirect links, and content spoofing within the trusted application origin. Version 2.0.0 fixes this issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	no fix listed	GHSA-4qgr-4h56-8895
Go	code.vikunja.io/api	no fix listed	GO-2026-4552

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	< 2.0.0

Weakness: CWE-79, CWE-80 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4qgr-4h56-8895 x_refsource_CONFIRM
https://vikunja.io/changelog/vikunja-v2.0.0-was-released x_refsource_MISC