Vikunja has Reflected HTML Injection via filter Parameter in its Projects Module

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

• CVE-2026-27116: 0.26% estimated exploitation activity in the next 30 days; percentile 17.44 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Vikunja is an open-source self-hosted task management platform with 3,300+ GitHub stars. 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. Attack flow: Attacker shares a crafted project filter link (routine Vikunja workflow) → victim opens it → victim clicks "Filter" (standard UI action) → phishing content renders inside trusted Vikunja interface. Affected Component | Field | Detail | |---|---| | Application | Vikunja v1.1.0 | | Module | Projects | | Endpoint | /projects/-1/-1?filter=PAYLOAD&page=1 | | Parameter | filter (GET) | | Trigger | Click "Filter" button | | Stack | Go backend, Vue.js + TypeScript frontend |…

Published by the source

25 Feb 2026, 22:01 UTC

Last modified by the source

27 Feb 2026, 21:50 UTC

Source last checked

26 Oct 2026, 15:14 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-4qgr-4h56-8895

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# Patch Next advisory brief: CVE-2026-27116

Advisory: Vikunja has Reflected HTML Injection via filter Parameter in its Projects Module
IDs: CVE-2026-27116, GHSA-4qgr-4h56-8895
Record: https://patchnext.com/advisories/cve-2026-27116 (revision 1, source checked 26 Oct 2026, 15:14 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go code.vikunja.io/api: affected <= 0.24.6

## Suggested inspection (read-only)
- Go code.vikunja.io/api: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on code.vikunja.io/api.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-4qgr-4h56-8895 (GitHub-reviewed advisory GHSA-4qgr-4h56-8895 lists affected ranges: Go code.vikunja.io/api >=0 <=0.24.6)

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