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CVE-2026-18119Concrete CMS below 9.5.3 is vulnerable to Stored XSS via unsanitized inline block custom style values
Concrete CMS below 9.5.3 did not sanitize custom style values in the Block Design dialog before writing them into page CSS via a DOM sink, permitting stored cross-site scripting. An editor-level user could execute script in an administrator's session and escalate privileges. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.0 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Nguyen Manh Thuan for reporting.
7.0 HIGHEPSS 0.46%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.0 | HIGH | 4.0ConcreteCMS (CNA) | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N |
| 9.0 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
Details
- CVE ID
- CVE-2026-18119
- Status
- Analyzed
- Assigner (CNA)
- ConcreteCMS
- Published
- Sep 14, 2026
- Last modified
- 2026-09-18 19:23 UTC
- Weaknesses
- CWE-79 · Improper neutralization of input during web page generation ('cross-site scripting')
Affected Products
As published by the CNA in the CVE record.
Concrete CMSConcrete CMS1 version range
- 5.0.0 through 9.5.2