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.
Published: 2026-09-15
Score: 9.3 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 16 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 16 Sep 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Cotonti cotonti
Cotonti siena
Vendors & Products Cotonti cotonti
Cotonti siena

Tue, 15 Sep 2026 21:15:00 +0000

Type Values Removed Values Added
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.
Title Cotonti 1.0.0 Comments Plugin PHP Object Injection via ci Parameter
First Time appeared Cotonti
Cotonti cotonti Siena
Weaknesses CWE-502
CPEs cpe:2.3:a:cotonti:cotonti_siena:*:*:*:*:*:*:*:*
Vendors & Products Cotonti
Cotonti cotonti Siena
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': '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'}


Subscriptions

Cotonti Cotonti Cotonti Siena Siena
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-16T19:18:18.518Z

Reserved: 2026-09-15T11:07:01.912Z

Link: CVE-2026-91939

cve-icon Vulnrichment

Updated: 2026-09-16T19:17:45.626Z

cve-icon NVD

Status : Deferred

Published: 2026-09-15T21:16:48.957

Modified: 2026-09-16T20:21:01.047

Link: CVE-2026-91939

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-16T21:00:08Z

Weaknesses
  • CWE-502

    Deserialization of Untrusted Data