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 ↗

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

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

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