Vulnerability · Published Aug 5, 2026 · Assigned by TuranSec

CVE-2026-71294Cotonti CMS Comments Plugin PHP Object Injection via Unrestricted unserialize() in Create/Edit Actions

High 7.7

In plain English

A high-severity unsafe deserialization in Cotonti from Cotonti. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.4%top 67.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Public PoC

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).

Affected products (as reported)

Vendor	Product	Versions
Cotonti	Cotonti	0 – through *

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

References

https://github.com/Cotonti/Cotonti third-party-advisory
https://github.com/Cotonti/Cotonti/blob/master/plugins/comments/controllers/actions/CreateAction.php third-party-advisory