CVE-2026-8134
CVE-2026-8134 · Concrete CMS 9.5.0 and below is vulnerable to Authenticated RCE via Composer customTemplate Path Traversal leading to PHP File Inclusion
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 9.4 · Critical · EPSS 0.7% · Fix available
- Published
- Updated
Stack: php
Affected products and versions
concrete cms
- Versions
- ≥ 5.0, ≤ 9.5.0: Affected (git)
No fix published
concrete5/concrete5 Packagist
- Versions
- 8.0
- 8.0.1
- 8.0.2
- 8.0.3
- 8.1.0
- 8.2.0
- 8.2.0RC2
- 8.2.1
- 8.3.0
- 8.3.1
- 8.3.2
- 8.4.0
- 8.4.0RC3
- 8.4.0RC4
- 8.4.1
- 8.4.2
- 8.4.3
- 8.4.4
- 8.4.5
- 8.5.0
- 8.5.0RC1
- 8.5.0RC2
- 8.5.1
- 8.5.10
- 8.5.11
- 8.5.12
- 8.5.13
- 8.5.14
- 8.5.15
- 8.5.16
- 8.5.17
- 8.5.18
- 8.5.19
- 8.5.2
- 8.5.20
- 8.5.21
- 8.5.3
- 8.5.4
- 8.5.5
- 8.5.6
- 8.5.6RC1
- 8.5.7
- 8.5.8
- 8.5.9
- 9.0.0
- 9.0.0RC1
- 9.0.0RC3
- 9.0.0RC4
- 9.0.1
- 9.0.2
- 9.1.0
- 9.1.1
- 9.1.2
- 9.1.3
- 9.2.0
- 9.2.0RC2
- 9.2.1
- 9.2.2
- 9.2.3
- 9.2.4
- 9.2.5
- 9.2.6
- 9.2.7
- 9.2.8
- 9.2.9
- 9.3.0
- 9.3.1
- 9.3.2
- 9.3.3
- 9.3.4
- 9.3.5
- 9.3.6
- 9.3.7
- 9.3.8
- 9.3.9
- 9.4.0
- 9.4.0RC1
- 9.4.0RC2
- 9.4.1
- 9.4.2
- 9.4.3
- 9.4.4
- 9.4.5
- 9.4.6
- 9.4.7
- 9.4.8
- 9.5.0
- 9.5.0RC1
- 9.5.0RC2
- Affected ranges
- ECOSYSTEM: < 9.5.1
Update to 9.5.1