Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction. (CVE-2026-93872)
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.
AI Analysis
Technical Summary
Cotonti 1.0.0's comments plugin EditAction unsafely unserializes a base64-decoded cb parameter without applying allowed_classes restrictions. This unsafe deserialization (CWE-502) enables authenticated users with comment write permissions to instantiate arbitrary PHP objects. Exploitation could lead to file write operations or remote code execution through crafted gadget chains. The vulnerability is identified as CVE-2026-93872 with a CVSS 3.1 score of 7.5 (AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). No patch or remediation information is provided.
Potential Impact
An attacker with registered user privileges and comment write permissions can exploit this vulnerability to instantiate arbitrary PHP objects. This may result in unauthorized file writes or remote code execution, compromising confidentiality, integrity, and availability of the affected system.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict comment write permissions to trusted users only and monitor for suspicious activity related to the comments plugin. Avoid exposing this functionality to untrusted users.
Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction. (CVE-2026-93872)
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.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Cotonti 1.0.0's comments plugin EditAction unsafely unserializes a base64-decoded cb parameter without applying allowed_classes restrictions. This unsafe deserialization (CWE-502) enables authenticated users with comment write permissions to instantiate arbitrary PHP objects. Exploitation could lead to file write operations or remote code execution through crafted gadget chains. The vulnerability is identified as CVE-2026-93872 with a CVSS 3.1 score of 7.5 (AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). No patch or remediation information is provided.
Potential Impact
An attacker with registered user privileges and comment write permissions can exploit this vulnerability to instantiate arbitrary PHP objects. This may result in unauthorized file writes or remote code execution, compromising confidentiality, integrity, and availability of the affected system.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict comment write permissions to trusted users only and monitor for suspicious activity related to the comments plugin. Avoid exposing this functionality to untrusted users.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-3v3g-3pf9-fgcf
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-93872"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6aade4e055bf5e2cf5ed9e06
Added to database: 09/19/2026, 01:26:56 UTC
Last enriched: 09/19/2026, 01:30:21 UTC
Last updated: 09/19/2026, 03:53:41 UTC
Views: 3
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