CVE-2026-91939
Cotonti 1.0.0 Comments Plugin PHP Object Injection via ci Parameter
- State
- Published
- Severity
- 9.3 Critical
- Published
- Sep 15, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 15, 2026
Description
Cotonti 1.0.0 Comments plugin passes the ci GET parameter to unserialize() without allowed_classes restriction, allowing unauthenticated attackers to instantiate arbitrary PHP classes with attacker-controlled properties. Attackers can exploit PHP object injection through crafted serialized payloads to trigger gadget chains and achieve database manipulation or code execution.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-502 Deserialization of Untrusted Data
Affected Products
| Product | Versions |
|---|---|
CotontiCotonti |
|
References
- GitHub Issue #1888issue-tracking
- Proposed fix PR #1889 (unmerged)patchissue-tracking
- CommentsWidget::run() at 1.0.0technical-description
- AJAX display controller at 1.0.0technical-description
- Default comments permissions at 1.0.0technical-description
- https://github.com/Cotonti/Cotontiproduct
- VulnCheck Advisory: Cotonti 1.0.0 Comments Plugin PHP Object Injection via ci Parameterthird-party-advisory
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