High
Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-66748
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:03 UTC · Revision 1
Source evidence
Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field
core-osv · Original sourcePublished 28 Jul 2026, 15:19 UTC
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.
osv:CVE-2026-66748
Complete source record
{
"id": "d310a4c36ad8db2073d2f5872fe0146106ebdefe1bf4e5b9916e1141b1d80294",
"url": "https://osv.dev/vulnerability/CVE-2026-66748",
"method": "structured",
"payload": {
"kind": "advisory",
"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.",
"evidence": "osv:CVE-2026-66748",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-66748",
"aliases": [
"CVE-2026-66748"
],
"metrics": [
{
"type": "CVSS_V4",
"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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/owen2345/camaleon-cms",
"type": "GIT",
"events": [
{
"introduced": "a9e64edaba0837bac051a432a06be1b401820cb6"
},
{
"last_affected": "cc71e01c909c9e7fa23ddc115981773ce1242b49"
},
{
"introduced": "45c15c72bf415015322512bc1f8069bdff240dd4"
},
{
"fixed": "45c15c72bf415015322512bc1f8069bdff240dd4"
},
{
"fixed": "158823668e2e5c3114a69b34cf1c96cb41533c5f"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "2.1.1"
},
{
"last_affected": "2.9.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "2.9.2"
},
{
"last_affected": "2.9.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
},
{
"range": [
{
"fixed": "45c15c72bf415015322512bc1f8069bdff240dd4"
}
],
"source": "REFERENCES_TAG",
"original_tag": "2.9.2"
},
{
"range": [
{
"fixed": "158823668e2e5c3114a69b34cf1c96cb41533c5f"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"2.9.2",
"2.9.1",
"2.9.0",
"2.8.3",
"2.8.2",
"2.8.1",
"2.8.0",
"2.7.5",
"2.7.4",
"2.7.3",
"2.7.1",
"2.7.0",
"2.6.4",
"2.6.2",
"2.6.1",
"2.6.0.1",
"2.6.0",
"2.5.3.1",
"2.5.3",
"2.5.1",
"2.4.6.7",
"2.4.6.1",
"2.4.6.0",
"2.4.5.14",
"2.4.5.13",
"2.4.5.12",
"camaleon_cms-2.4.5.11.gem",
"2.4.5.11",
"2.4.5.10",
"2.4.5.7",
"2.4.5.1",
"2.4.5",
"2.4.4.6",
"2.4.4.5",
"2.4.4.3",
"2.4.4.2",
"2.4.4",
"2.4.3.12",
"2.4.3.11",
"2.4.3.10",
"2.4.3.7",
"2.4.3",
"2.4.2",
"2.4.1",
"2.4.0",
"2.3.7",
"2.3.6",
"2.3.5",
"2.3.4",
"2.3.3",
"2.3.2",
"2.3.1",
"2.2.0",
"2.1.2.0",
"v2.1.1.3",
"2.1.2",
"2.1.1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66748.json"
}
}
],
"modified": "2026-10-28T02:30:37.082217988Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66748.json",
"https://github.com/owen2345/camaleon-cms/releases/tag/2.9.2",
"https://nvd.nist.gov/vuln/detail/CVE-2026-66748",
"https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-eval-custom-field",
"https://github.com/owen2345/camaleon-cms/pull/1136",
"https://github.com/owen2345/camaleon-cms/commit/158823668e2e5c3114a69b34cf1c96cb41533c5f",
"https://github.com/owen2345/camaleon-cms",
"https://enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/",
"https://github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field",
"https://tpaidakis.com/writeups/camaleon-cms-rce-select-eval/"
],
"provider_metadata": {
"cwe_ids": [
"CWE-94"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66748.json"
}
},
"related_cves": [
{
"value": "CVE-2026-66748",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504449,
"published_at": "2026-07-28T15:19:52.609+00:00"
}