What is CVE-2026-52781?

CVE-2026-52781 is a medium-severity vulnerability in Opf Openproject, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-06-26.

How severe is CVE-2026-52781?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Opf Openproject

CVE-2026-52781

OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, the HTML sanitizer grants <macro> elements unrestricted data-* attributes via :data wildcard. An attacker injects data-controller="poll-for-chan…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

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

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-52781?: CVE-2026-52781 is a medium-severity vulnerability in Opf Openproject, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-06-26.
How severe is CVE-2026-52781?: Medium severity. CVSS v3 base score is 6.4 out of 10.