CVE-2026-93872
Cotonti 1.0.0 PHP Object Injection via Comments Plugin Edit Action cb Parameter
- State
- Published
- Severity
- 7.7 High
- Published
- Sep 18, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.7 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-502 Deserialization of Untrusted Data
Affected Products
| Product | Versions |
|---|---|
CotontiCotonti |
|
References
- https://github.com/Cotonti/Cotonti/issues/1894issue-tracking
- https://github.com/Cotonti/Cotonti/pull/1897patchissue-tracking
- https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/EditAction.phptechnical-description
- https://github.com/Cotonti/Cotonti/blob/1.0.0/system/cache.phptechnical-description
- https://github.com/Cotonti/Cotontiproduct
- VulnCheck Advisory: Cotonti 1.0.0 PHP Object Injection via Comments Plugin Edit Action cb Parameterthird-party-advisory
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