OCTOBER 7, 2026
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Case File

CVE-2026-91939

CRITICAL · CVSS 9.8 EPSS 0.98% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-10-07

CyberRota Analysis

AI-Generated

The Cotonti 1.0.0 Comments plugin is vulnerable due to improper handling of the ci GET parameter, which allows unauthenticated attackers to exploit PHP object injection by passing crafted serialized payloads. This can lead to arbitrary PHP class instantiation, enabling attackers to manipulate databases or execute arbitrary code. Organizations using this plugin should prioritize patching this vulnerability to mitigate the risk of severe security breaches.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit code execution
GitHub PoC Links
github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-91939
Severity
CRITICAL
CVSS
9.8
EPSS
0.98%

Original NVD 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.