Vulnerability · Published Sep 18, 2026 · Assigned by VulnCheck
CVE-2026-93872Cotonti 1.0.0 PHP Object Injection via Comments Plugin Edit Action cb Parameter
High 7.5
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 0.7% (higher than 54% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 46.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction. Registered users with comment write permissions can instantiate arbitrary PHP objects and potentially achieve file write or code execution through gadget chains.
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/Cotonti/Cotonti/issues/1894 issue-tracking
- https://github.com/Cotonti/Cotonti/pull/1897 patch, issue-tracking
- https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/EditAction.php technical-description
- https://github.com/Cotonti/Cotonti/blob/1.0.0/system/cache.php technical-description
- https://github.com/Cotonti/Cotonti product
- VulnCheck Advisory: Cotonti 1.0.0 PHP Object Injection via Comments Plugin Edit Action cb Parameter third-party-advisory