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CVE-2026-91939

Cotonti 1.0.0 Comments Plugin PHP Object Injection via ci Parameter

CVSS 4.0 9.3 CRITICALCVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91939

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91939

Published

Cotonti

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Cotonti",
                    "product": "Cotonti",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:composer/cotonti/cotonti",
                    "repo": "https://github.com/Cotonti/Cotonti",
                    "programFiles": [
                        "plugins/comments/inc/CommentsWidget.php"
                    ],
                    "versions": [
                        {
                            "version": "1.0.0",
                            "lessThanOrEqual": "1.0.0",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON