# CVE-2026-93872: Cotonti insecure unserialize in comments plugin

Source: https://junglewise.ai/threats/cve-2026-93872-cotonti-1-0-0-passes-the-base64-decoded-cb-parameter-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-93872 · Severity: high · CVSS 7.5 · Published 2026-09-18

Cotonti is a PHP content management framework used to build websites and online applications. A vulnerability in its comments plugin allows authenticated users with comment editing permissions to instantiate arbitrary PHP objects through a base64-encoded parameter, potentially leading to unauthorized file modification or remote code execution on the affected server.

Technologies: [Cotonti](https://junglewise.ai/threats/technologies/cotonti). Vendors: [Cotonti](https://junglewise.ai/threats/vendors/cotonti).

## Quick answers

**Is CVE-2026-93872 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93872 being exploited in the wild.

**How severe is CVE-2026-93872?** High severity, with a CVSS score of 7.5, published 18 September 2026.

**Which products and versions are affected?** Cotonti 1.0.0.

**Is there a fix for CVE-2026-93872?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-93872 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-93872?** Check whether you run Cotonti at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in the comments plugin's EditAction controller, which passes a base64-decoded parameter directly to PHP's unserialize() function without restricting object instantiation through the allowed_classes parameter. An authenticated attacker with comment write permissions can craft a malicious serialized payload to trigger gadget chain exploitation, resulting in file write or arbitrary code execution.

## Affected products

- Cotonti Cotonti 1.0.0

## Timeline

- 2026-09-18: disclosed

## References

- [https://github.com/Cotonti/Cotonti](https://github.com/Cotonti/Cotonti)
- [https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/EditAction.php](https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/EditAction.php)

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