EUVD-2026-79143
GHSA-qh33-6hmp-jg6p
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/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
1DescriptionCVE.org
Concrete CMS before 9.5.3 rendered Express entry labels as raw HTML when displaying associated entries, resulting in stored cross-site scripting. An unauthenticated attacker could submit a payload through a public Express Form; it then executed in an administrator's dashboard session when the associated entry was viewed, or in the browser of any visitor to a page using an Express Entry List block with association columns, allowing actions to be performed with that user's privileges. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks v01demort for reporting.
AnalysisAI
Stored cross-site scripting in Concrete CMS 5.0.0 through 9.5.2 lets an unauthenticated attacker inject raw HTML through a publicly accessible Express Form; the payload is rendered unsanitized as an Express entry label whenever associated entries are displayed, executing in an administrator's dashboard session and in the browsers of visitors to pages containing an Express Entry List block with association columns. The Concrete CMS security team rates this CVSS v4.0 2.3 (AV:N/AC:L/AT:P/PR:N/UI:P), reflecting that exploitation depends on specific Express configuration and passive victim interaction rather than open, unconditional exposure. …
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External POC / Exploit Code
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