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CVE-2026-18119

Concrete CMS below 9.5.3 is vulnerable to Stored XSS via unsanitized inline block custom style values PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Concrete CMS / Concrete CMSaffected 5.0.0 through 9.5.2

CWE

CWE-79

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.