EUVD-2026-77805
GHSA-fjhh-g9g9-wm99
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (ConcreteCMS) · only source for this CVE.
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Stored cross-site scripting in Concrete CMS versions 5.0.0 through 9.5.2 lets an editor-level account inject unsanitized custom style values through the Block Design dialog, which are then written into page CSS via a DOM sink and execute in the browser of any higher-privileged user who views the affected page. Because the payload runs in an administrator's session, an editor can hijack the admin session and escalate to full administrative control of the site. …
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External POC / Exploit Code
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