EUVD-2026-80000
GHSA-xv9c-9hwm-jp8g
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Unauthenticated network-reachable unserialize() sink with no user interaction (AV:N/AC:L/PR:N/UI:N); object injection to gadget-chain RCE yields full C/I/A impact on the application host.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
PHP object injection in the Cotonti 1.0.0 Comments plugin allows unauthenticated, network-reachable attackers to instantiate arbitrary PHP classes with attacker-controlled properties by feeding a crafted base64-encoded payload through the ci GET parameter, which is passed to unserialize() without an allowed_classes restriction. Any default Cotonti 1.0.0 deployment with the Comments plugin enabled and its widget rendering is exposed; no credentials or user interaction are required, and successful gadget-chain abuse can lead to database manipulation or remote code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Cotonti 1.0.0 installation has the Comments plugin enabled and rendering the Comments widget, which reads the `ci` GET parameter and passes it through base64_decode() into unserialize() without an allowed_classes restriction. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 9.3 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H) reflects a genuinely severe pre-authentication vulnerability: PHP object injection (CWE-502) reachable over the network with no privileges or user interaction, driven by the Comments plugin passing the base64-decoded `ci` GET parameter straight into unserialize() with no allowed_classes restriction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary fix is the upstream change delivered in Cotonti pull request #1889 (https://github.com/Cotonti/Cotonti/pull/1889): the `@unserialize(base64_decode($ci))` call in plugins/comments/inc/CommentsWidget.php must be replaced with `@unserialize(base64_decode($ci), ['allowed_classes' => false])` plus the added validation that the decoded value is an array with a string at index 0 and an array at index 1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Cotonti 1.0.0 instances and identify those with the Comments plugin enabled and widget rendering active; disable the plugin or widget rendering where feasible, or block and sanitize the ci GET parameter at the WAF or reverse proxy to reject base64-encoded serialized payloads. …
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External POC / Exploit Code
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