What is CVE-2026-46386?

CVE-2026-46386 is a critical-severity vulnerability in Opf Openproject, classified under Deserialization of Untrusted Data. CVSS score: 9.9/10. Published 2026-06-26.

How severe is CVE-2026-46386?

Critical severity. CVSS v3 base score is 9.9 out of 10.

RCE in Opf Openproject

CVE-2026-46386

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 = :mar…

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Opf Openproject — versions >= 8.3.0, < 17.2.4, >= 17.3.0, < 17.3.2

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data
CWE-798 — Use of Hard-coded Credentials
CWE-1188 — Initialization of a Resource with an Insecure Default
CWE-1392

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-46386?: CVE-2026-46386 is a critical-severity vulnerability in Opf Openproject, classified under Deserialization of Untrusted Data. CVSS score: 9.9/10. Published 2026-06-26.
How severe is CVE-2026-46386?: Critical severity. CVSS v3 base score is 9.9 out of 10.