CVE-2026-8134
- Source
- https://cve.org/CVERecord?id=CVE-2026-8134
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8134.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-8134
- Aliases
- Published
- 2026-05-21T20:13:31Z
- Modified
- 2026-08-12T03:51:31Z
- Severity
-
- 9.4 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CVSS Calculator
- Summary
- Concrete CMS 9.5.0 and below is vulnerable to Authenticated RCE via Composer customTemplate Path Traversal leading to PHP File Inclusion
- Details
-
Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTemplate field when saving page type composer form layouts. An authenticated rogue administrator with composer form editing rights can exploit this to include arbitrary readable files on the server. Combined with the file uploader's extension-only validation (which permits PHP code in files saved with image extensions like .png), this can result in authenticated remote code execution. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 9.4 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Thanks Yonatan Drori (Tenzai) for reporting.
- Database specific
{ "cna_assigner": "ConcreteCMS", "cwe_ids": [ "CWE-23", "CWE-434", "CWE-98" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8134.json" }- References
Affected packages
Git / github.com/concretecms/concretecms
Affected ranges
- Type
- GIT
- Repo
- https://github.com/concretecms/concretecms
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedLast Affected
- Database specific
-
Show details
{ "cpe": "cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "5.0" }, { "last_affected": "9.5.0" }, { "introduced": "0" } ], "source": [ "AFFECTED_FIELD", "CPE_RANGE" ] }