Is CVE-2026-52780 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-52780 being exploited in the wild.

How severe is CVE-2026-52780?

Critical severity, with a CVSS score of 9.6, published 26 June 2026.

Which products and versions are affected?

opf OpenProject = 17.4.0 < 17.4.1.

Is there a fix for CVE-2026-52780?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-52780 attacked?

It is attacked from the adjacent network, in a web application.

Am I affected by CVE-2026-52780?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-52780: OpenProject cache store poisoning leads to RCE

Q: Is there a fix for CVE-2026-52780?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-52780 attacked?

It is attacked from the adjacent network, in a web application.

Q: Am I affected by CVE-2026-52780?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-52780 · Severity: critical · CVSS 9.6 · Published 2026-06-26

OpenProject, a web-based project management platform, is vulnerable to a critical security flaw that allows an attacker to take complete control of the server. By manipulating the application's data caching system, an attacker can execute malicious commands remotely. This could lead to the theft of sensitive project data, total service disruption, or unauthorized access to the underlying corporate infrastructure.

Quick answers

Is CVE-2026-52780 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-52780 being exploited in the wild.
How severe is CVE-2026-52780?: Critical severity, with a CVSS score of 9.6, published 26 June 2026.
Which products and versions are affected?: opf OpenProject < 17.3.3, >= 17.4.0 < 17.4.1.
Is there a fix for CVE-2026-52780?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-52780 attacked?: It is attacked from the adjacent network, in a web application.
Am I affected by CVE-2026-52780?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A vulnerability in OpenProject's cache store mechanism allows for cache poisoning, which can be escalated to Remote Code Execution (RCE). The flaw is rooted in improper input validation (CWE-20) within the caching component. An attacker on the same adjacent network can exploit this without any prior authentication or user interaction. By poisoning the cache, the attacker can inject and execute arbitrary code within the context of the application server. The issue has been addressed in versions 17.3.3 and 17.4.1.

Affected products

opf OpenProject < 17.3.3, >= 17.4.0 < 17.4.1

Timeline

2026-06-08: advisory: GitHub Security Advisory published
2026-06-26: disclosed: NVD publication date

References

https://github.com/opf/openproject/security/advisories/GHSA-qj96-f42f-6336

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