What is CVE-2026-52780?

CVE-2026-52780 is a critical-severity vulnerability in Opf Openproject, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-06-26.

How severe is CVE-2026-52780?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Improper input validation in Opf Openproject

CVE-2026-52780

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Opf Openproject — versions < 17.3.3, >= 17.4.0, < 17.4.1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-52780?: CVE-2026-52780 is a critical-severity vulnerability in Opf Openproject, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-06-26.
How severe is CVE-2026-52780?: Critical severity. CVSS v3 base score is 9.6 out of 10.