Vulnerability-Lookup

CVE-2026-66748 (GCVE-0-2026-66748)

Vulnerability from cvelistv5 – Published: 2026-07-28 15:19 – Updated: 2026-07-31 20:59 X_Open Source

Title

Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field

Summary

Camaleon CMS versions 2.1.1 through 2.9.1 contains an authenticated remote code execution vulnerability that allows users with custom_fields manage permission to execute arbitrary Ruby code by supplying a malicious expression through the select_eval custom field type. Attackers can store an attacker-controlled Ruby expression in the field options command parameter, which is evaluated via instance_eval within an ERB view whenever a post edit page is rendered, achieving server-side code execution with web server process privileges.

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: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

VulnCheck

References

7 references

URL	Tags
https://tpaidakis.com/writeups/camaleon-cms-rce-s…	technical-descriptionexploit
https://enrik-m.github.io/posts/Camaleon-CMS-Vuln…	technical-descriptionexploit
https://github.com/theopaid/Camaleon-CMS---Authen…	exploittechnical-description
https://github.com/owen2345/camaleon-cms/releases…	release-notes
https://github.com/owen2345/camaleon-cms/pull/1136	issue-tracking
https://github.com/owen2345/camaleon-cms/commit/1…	patch
https://www.vulncheck.com/advisories/camaleon-cms…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
owen2345	camaleon-cms	Affected: 2.1.1 , ≤ 2.9.1 (semver) Affected: 2.9.2 (semver)

Date Public

2026-04-05 00:00

Credits

Theodosis Paidakis Ik0nw Thomas Wells Amir Aliu & Enrik Mustafa l1nk

Show details on NVD website

JSON

To clipboard

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GHSA-7XM9-634W-F5R7

Vulnerability from github – Published: 2026-07-28 18:33 – Updated: 2026-07-31 21:31

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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  ],
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    "cwe_ids": [
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-28T16:20:16Z",
    "severity": "HIGH"
  },
  "details": "Camaleon CMS versions 2.1.1 through 2.9.1 contains an authenticated remote code execution vulnerability that allows users with custom_fields manage permission to execute arbitrary Ruby code by supplying a malicious expression through the select_eval custom field type. Attackers can store an attacker-controlled Ruby expression in the field options command parameter, which is evaluated via instance_eval within an ERB view whenever a post edit page is rendered, achieving server-side code execution with web server process privileges.",
  "id": "GHSA-7xm9-634w-f5r7",
  "modified": "2026-07-31T21:31:50Z",
  "published": "2026-07-28T18:33:02Z",
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66748"
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    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-eval-custom-field"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/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",
      "type": "CVSS_V4"
    }
  ]
}

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.

Action not permitted

CVE-2026-66748 (GCVE-0-2026-66748)

GHSA-7XM9-634W-F5R7

Tags

Sightings

Nomenclature