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TI-2026-40894 Aliases CVE-2026-56721GHSA-m39h-f7fw-54qw

CamaleonCMS 2.9.2 Privilege Escalation via Parameter Confusion in UsersController

Priority MEDIUM 40CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
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-639.

Summary

CamaleonCMS version 2.9.2 and earlier contains a privilege escalation vulnerability via insecure direct object reference (IDOR) that allows authenticated low-privileged attackers to overwrite any user's credentials by exploiting a parameter confusion flaw between the authorization filter and action body in the UsersController. Attackers can send a PATCH request to the updated_ajax endpoint setting params[:id] to their own user ID to pass the self-authorization check while simultaneously setting params[:user_id] to a victim's ID, causing the controller to load and mutate the victim's account, including overwriting administrator passwords to achieve full site takeover.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00523 44th 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
None
Automatable
No
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
owen2345CamaleonCMSup to 2.9.2—No fix listedCNA
  • CamaleonCMS Vendorowen2345 Affected up to 2.9.2 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-2026-56721
  2. 2026-10-03 Alias added: GHSA-m39h-f7fw-54qw

References

Patch 1

Other 2

  • TI-2023-14148 Camaleon CMS v2.7.0 was discovered to contain a Server-Side Template Injection (SSTI)… CVSS 3.1CRITICAL 9.8
  • TI-2024-31375 Arbitrary file write leading to RCE in Camaleon CMS CVSS 3.1CRITICAL 10.0
  • TI-2026-47396 Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field CVSS 4.0HIGH 8.7
  • TI-2021-07976 Camaleon CMS - Insufficient Session Expiration after Password Change CVSS 3.1HIGH 8.8
  • TI-2024-31376 Arbitrary path traversal in Camaleon CMS CVSS 3.1HIGH 7.7
  • TI-2026-51449 CamaleonCMS Missing Authorization via Plugin Administration Endpoints CVSS 4.0HIGH 7.2
See all 26 →

Sources

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