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TI-2026-62074 Aliases CVE-2026-91939GHSA-xv9c-9hwm-jp8g

Cotonti 1.0.0 Comments Plugin PHP Object Injection via ci Parameter

Priority HIGH 81CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00978 62nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CotontiCotonti1.0.0 – 1.0.0—No fix listedCNA
  • Cotonti VendorCotonti Affected 1.0.0 – 1.0.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-91939
  2. 2026-10-03 Alias added: GHSA-xv9c-9hwm-jp8g

References

Patch 1

Other 5

  • TI-2026-63195 Cotonti through 1.0.0 Predictable Password Recovery Token via Weak PRNG CVSS 4.0CRITICAL 9.2
  • TI-2026-41862 Cotonti Siena 0.9.26 CSRF via admin.php Config Update Endpoint CVSS 4.0HIGH 8.7
  • TI-2026-84359 Predictable tokens in Cotonti let attackers bypass email verification CVSS 4.0MEDIUM 6.3
  • TI-2025-28591 A vulnerability has been found in Cotonti Siena v0.9.25. CVSS 3.1MEDIUM 5.4
  • TI-2024-16007 A stored cross-site scripting (XSS) vulnerability in the Edit Page function of Cotonti… CVSS 3.1MEDIUM 5.4
  • TI-2026-63200 Cotonti through 1.0.0 Cross-Site Request Forgery in the Contact Plugin CVSS 4.0MEDIUM 5.3
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences