---
title: "CVE-2026-93872: Cotonti - Insecure Deserialization"
description: "Cotonti 1.0.0 contains an insecure deserialization vulnerability caused by passing base64-decoded cb parameter to unserialize() without allowed_classes restriction in comments plugin EditAction, letting registered users with comment write permissions instantiate arbitrary PHP objects and potentially achieve file write or code execution."
url: https://panop.io/threat-heartbeat/CVE-2026-93872/
---

# CVE-2026-93872 Cotonti - Insecure Deserialization

Cotonti 1.0.0 contains an insecure deserialization vulnerability caused by passing base64-decoded cb parameter to unserialize() without allowed\_classes restriction in comments plugin EditAction, letting registered users with comment write permissions instantiate arbitrary PHP objects and potentially achieve file write or code execution.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.71% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93872)

## Details

Type

Insecure Deserialization

Impact

Remote Code Execution, File System Write

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

18 September 2026

Updated

15 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Update to the latest version with allowed\_classes restriction in unserialize() or apply patch to restrict unserialize() usage.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-93872](https://nvd.nist.gov/vuln/detail/CVE-2026-93872)
- [https://www.vulncheck.com/advisories/cotonti-1.0.0-php-object-injection-via-comments-plugin-edit-action-cb-parameter](https://www.vulncheck.com/advisories/cotonti-1.0.0-php-object-injection-via-comments-plugin-edit-action-cb-parameter)
- [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)
- [https://github.com/Cotonti/Cotonti/blob/1.0.0/system/cache.php](https://github.com/Cotonti/Cotonti/blob/1.0.0/system/cache.php)
- [https://github.com/Cotonti/Cotonti/issues/1894](https://github.com/Cotonti/Cotonti/issues/1894)
- [https://github.com/Cotonti/Cotonti/pull/1897](https://github.com/Cotonti/Cotonti/pull/1897)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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