CVE-2026-71294 Cotonti CMS Comments Plugin PHP Object Injection via Unrestricted unserialize() in Create/Edit Actions
Attackers with comment write access can execute arbitrary code via PHP object injection in the Cotonti CMS Comments plugin.
- 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-2026-71294?
CVE-2026-71294 is a high-severity unsafe deserialization vulnerability in Cotonti, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Cotonti CMS's Comments plugin deserializes user-supplied data without restricting the classes that may be instantiated. In plugins/comments/controllers/actions/CreateAction.php, a POST parameter obtained via (trim-only sanitization) is passed to with no restriction, reachable by any member with write access to comments (the default setting in plugins/comments/comments.setup.php).
Weakness: CWE-502
Which versions are affected by CVE-2026-71294?
How do I fix CVE-2026-71294?
No fix has been published for CVE-2026-71294 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-2026-71294 being exploited?
There is no known exploitation of CVE-2026-71294 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-rm37-v7mc-6795.