Critical severity · published Jun 26, 2026
CVE-2026-46386
OpenProject: Pre-authentication RCE in openproject/openproject Docker image via default `SECRET_KEY_BASE=OVERWRITE_ME` and `cookies_serializer = :marshal`
9.9
CVSS
0.5%
EPSS
No
On KEV
Description
OpenProject is open-source, web-based project management software. Prior to , the official openproject/openproject Docker image ships ENV SECRET_KEY_BASE=OVERWRITE_ME as the default Rails master key. Combined with cookies_serializer = :marshal, this gives any logged-in user a deterministic Marshal-deserialization path reachable via the /my/two_factor_devices cookie reader This vulnerability is fixed in .
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openproject · opf
>= 8.3.0, < 17.2.4; >= 17.3.0, < 17.3.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46386
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-46386
github.com
https://github.com/opf/openproject/security/advisories/GHSA-r85r-gjq2-f83r
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