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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cotonti | Cotonti | — | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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HarshRajSinghania/cotonti-commentswidget-poc ★ 0 · Sep 13, 2026
Safe local proof of concept for the Cotonti CommentsWidget PHP object injection vulnerability (CAN-2026-2035973 / CVE-2026-71294).
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
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