Critical severity · published Jun 26, 2026
CVE-2026-52780
OpenProject: Cache store poisoning leads to Remote Code Execution (RCE)
9.6
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openproject · opf
< 17.3.3; >= 17.4.0, < 17.4.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-52780
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-52780
github.com
https://github.com/opf/openproject/security/advisories/GHSA-qj96-f42f-6336
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