medium5.4
CVE-2026-35600
Vikunja has HTML Injection via Task Titles in Overdue Email Notifications
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | code.vikunja.io/api | <= 2.2.2 | 2.3.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Vikunja | Vikunja | before 2.3.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/go-vikunja/vikunja/commit/0f3730d045f20e261e3cdfc6d93c325653395b64
- https://github.com/go-vikunja/vikunja/pull/2580
- https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-45q4-x4r9-8fqj
- https://github.com/advisories/GHSA-45q4-x4r9-8fqj
- https://nvd.nist.gov/vuln/detail/CVE-2026-35600