CVE-2026-35600

Vikunja has HTML Injection via Task Titles in Overdue Email Notifications

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, task titles are embedded directly into Markdown link syntax in overdue email notifications without escaping Markdown special characters. When rendered by goldmark and sanitized by bluemonday (which allows <a> and <img> tags), injected Markdown constructs produce phishing links and tracking pixels in legitimate notification emails. This vulnerability is fixed in 2.3.0.

Affected

go-vikunja · vikunja

CVSS v3.1 GITHUB

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS

0.31% chance of exploitation in the next 30 days, 22nd percentile

Published

2026-04-10

Updated

2026-04-14

Proof-of-concept exploits (1)

• advisories/GHSA-45q4-x4r9-8fqj

Security advisories

• go-vikunja/vikunja/security/advisories/GHSA-45q4-x4r9-8fqj
• go-vikunja/vikunja/pull/2580

References

• CVE Record
• NVD entry