CVE-2026-52780: Opf Openproject

Critical severity, CVSS 9.6. EPSS: 0.4% chance of exploitation in the next 30 days.

OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, cache store poisoning leads to Remote Code Execution (RCE). This vulnerability is fixed in 17.3.3 and 17.4.1.

Affected products

• Opf Openproject: before 17.3.3 (fixed in 17.3.3); from 17.4.0, before 17.4.1 (fixed in 17.4.1)

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