# CVE-2026-46386

## Summary

- **CVE ID:** CVE-2026-46386
- **Severity:** CRITICAL
- **CVSS Score:** 9.9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** CWE-502, CWE-798, CWE-1188, CWE-1392
- **Published:** Jun 26, 2026
- **Last Modified:** Jun 26, 2026

## 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 .

## Affected Products

- opf — openproject (>= 8.3.0, < 17.2.4)
- opf — openproject (>= 17.3.0, < 17.3.2)

## References

- [CNA](https://github.com/opf/openproject/security/advisories/GHSA-r85r-gjq2-f83r)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.49%
- **EPSS Percentile:** 40.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._