Vulnerability-Lookup

CVE-2026-56721 (GCVE-0-2026-56721)

Vulnerability from cvelistv5 – Published: 2026-08-11 15:48 – Updated: 2026-08-11 17:49

Title

CamaleonCMS 2.9.2 Privilege Escalation via Parameter Confusion in UsersController

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.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 17:44 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/owen2345/camaleon-cms	product
https://github.com/owen2345/camaleon-cms/pull/1185	issue-tracking
https://github.com/owen2345/camaleon-cms/commit/2…	patch
https://www.vulncheck.com/advisories/camaleoncms-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
owen2345	CamaleonCMS	Affected: 0 , ≤ 2.9.2 (semver)

Date Public

2026-08-10 00:00

Credits

Saidakbarxon Maxsudxonov

Show details on NVD website

JSON

To clipboard

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GHSA-M39H-F7FW-54QW

Vulnerability from github – Published: 2026-08-11 18:30 – Updated: 2026-08-11 18:30

Details

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2026-56721"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-11T16:17:33Z",
    "severity": "HIGH"
  },
  "details": "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\u0027s 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\u0027s ID, causing the controller to load and mutate the victim\u0027s account, including overwriting administrator passwords to achieve full site takeover.",
  "id": "GHSA-m39h-f7fw-54qw",
  "modified": "2026-08-11T18:30:48Z",
  "published": "2026-08-11T18:30:48Z",
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    {
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56721"
    },
    {
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      "url": "https://github.com/owen2345/camaleon-cms/pull/1185"
    },
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    },
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      "url": "https://github.com/owen2345/camaleon-cms"
    },
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    }
  ],
  "schema_version": "1.4.0",
  "severity": [
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      "type": "CVSS_V4"
    }
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-56721 (GCVE-0-2026-56721)

GHSA-M39H-F7FW-54QW

Tags

Sightings

Nomenclature