CVE-2026-44696: Opf Openproject

Medium severity, CVSS 5.7. EPSS: 0.3% chance of exploitation in the next 30 days.

OpenProject is open-source, web-based project management software. Prior to 17.4.0, OpenProject's rich text (markdown) rendering pipeline uses Sanitize::Config::RELAXED[:css] for inline style sanitization. This configuration permits essentially all CSS properties in style attributes on permitted HTML elements (figure, img, table, th, tr, td). This allows any authenticated user with write access to formattable text fields (work package descriptions, comments, project descriptions, news) to inject CSS This vulnerability is fixed in 17.4.0.

Affected products

• Opf Openproject: before 17.4.0 (fixed in 17.4.0)

Published 2026-06-26. Last modified 2026-06-27.