Critical 9.8Published Sep 15, 2026

CVE-2026-91939Cotonti 1.0.0 Comments Plugin PHP Object Injection via ci Parameter

Updated under an hour ago (2026-10-19 06:25 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-502
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Cotonti Cotonti cotonti:cotonti (from the name)	from 1.0.0 through 1.0.0	CNA record

References

https://github.com/Cotonti/Cotonti/issues/1888issue-tracking
https://github.com/Cotonti/Cotonti/pull/1889patch, issue-tracking
https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/inc/CommentsWidget.phptechnical-description
https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/controllers/actions/DisplayAction.phptechnical-description
https://github.com/Cotonti/Cotonti/blob/1.0.0/plugins/comments/comments.setup.phptechnical-description
https://github.com/Cotonti/Cotontiproduct
https://www.vulncheck.com/advisories/cotonti-1.0.0-comments-plugin-php-object-injection-via-ci-parameterthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.