CVE-2026-46386 PUBLISHED

OpenProject: Pre-authentication RCE in openproject/openproject Docker image via default `SECRET_KEY_BASE=OVERWRITE_ME` and `cookies_serializer = :marshal`

Assigner: GitHub_M
Reserved: 13.05.2026 Published: 26.06.2026 Updated: 26.06.2026

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 .

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9.9

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	opf
Product	openproject
Versions	Version >= 8.3.0, < 17.2.4 is affected Version >= 17.3.0, < 17.3.2 is affected

References

https://github.com/opf/openproject/security/advisories/GHSA-r85r-gjq2-f83r

Problem Types

CWE-502: Deserialization of Untrusted Data CWE
CWE-798: Use of Hard-coded Credentials CWE
CWE-1188: Insecure Default Initialization of Resource CWE
CWE-1392: Use of Default Credentials CWE