EUVD-2026-83369
GHSA-3v3g-3pf9-fgcf
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/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
Network vector, authenticated comment-write user (PR:L), no interaction; AC:H because full impact depends on a usable gadget chain; C/I/A:H reflect potential code execution.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction. Registered users with comment write permissions can instantiate arbitrary PHP objects and potentially achieve file write or code execution through gadget chains.
AnalysisAI
PHP object injection in Cotonti 1.0.0 allows authenticated users with comment-write permissions to pass attacker-controlled base64-encoded data through the cb (comeback) parameter of the comments plugin EditAction, which is then unserialized without an allowed_classes restriction. This can lead to arbitrary PHP object instantiation and, only if a viable POP gadget chain exists among loaded classes, escalation to file write or remote code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated account on the Cotonti 1.0.0 site holding comment write permissions (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 base score of 7.7 (AV:N/AC:H/AT:P/PR:L/UI:N, full VC/VI/VA:H) rests on a genuine PHP Object Injection primitive: unserialize() on attacker-controlled base64 data with no allowed_classes restriction, confirmed by the vendor patch diff (PR #1897) which adds ['allowed_classes' => false]. … 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 | Apply the upstream fix from PR #1897 (https://github.com/Cotonti/Cotonti/pull/1897), which adds ['allowed_classes' => false] to the unserialize() call in plugins/comments/controllers/actions/EditAction.php; this restricts deserialization to arrays and scalar types, eliminating PHP object injection. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Cotonti 1.0.0 deployments, confirm whether the comments plugin and comment-write permissions are enabled, and apply the vendor patch referenced in PR #1897 or upgrade to the latest patched Cotonti release; if patching cannot be completed immediately, temporarily restrict comment-write permissions to trusted roles and monitor web logs for suspicious base64-encoded cb parameters. …
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External POC / Exploit Code
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