XSS in Go-Vikunja Vikunja
CVE-2026-27616
Vikunja is an open-source self-hosted task management platform. Prior to version 2.0.0, the application allows users to upload SVG files as task attachments. SVG is an XML-based format that supports JavaScript execution through elements such as <script> tags or event handlers like onload. The application does not sanitize SVG content before storing it. When the uploaded SVG file is accessed via its direct URL, it is rendered inline in the browser under the application's origin. As a result, embedded JavaScript executes in the context of the authenticated user. Because the authentication token is stored in localStorage, it is accessible via JavaScript and can be retrieved by a malicious payload. Version 2.0.0 patches this issue.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (50.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Go-Vikunja Vikunja — versions < 2.0.0
- Vikunja
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-7jp5-298q-jg98 (Vendor Advisory)
- github.com/user-attachments/files/25414870/Stored.XSS.Proof.of.concept.pdf (Exploit, Third Party Advisory)
- vikunja.io/changelog/vikunja-v2.0.0-was-released (Release Notes)
Frequently asked questions
- What is CVE-2026-27616?
- CVE-2026-27616 is a high-severity vulnerability in Go-Vikunja Vikunja, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-02-25.
- How severe is CVE-2026-27616?
- High severity. CVSS v3 base score is 7.3 out of 10.