CVE-2026-46386 Deserialization in openproject
Attackers can achieve remote code execution in OpenProject Docker deployments due to hardcoded default secrets and unsafe cookie deserialization.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-46386?
CVE-2026-46386 is a critical unsafe deserialization vulnerability in opf openproject, published on 26 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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 .
Which versions are affected by CVE-2026-46386?
How do I fix CVE-2026-46386?
No fix has been published for CVE-2026-46386 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-46386 being exploited?
There is no known exploitation of CVE-2026-46386 in the wild and no public exploit code.
Sources
Also known as GHSA-r85r-gjq2-f83r.