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Concrete CMS below version 9.4.8 is vulnerable to Stored XSS in Search Results via Page Names

Medium · published March 4, 2026

CVSS v4.0

4.8

EPSS

Percentile

19.8

In the wild

Unconfirmed

What it is

In Concrete CMS below version 9.4.8, A stored cross-site scripting (XSS) vulnerability exists in the search block where page names and content are rendered without proper HTML encoding in search results. This allows authenticated, rogue administrators to inject malicious JavaScript through page names that executes when users search for and view those pages in search results. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks zolpak for reporting

The record

Technical detail

CVSS v4.0: 4.8 · MEDIUM
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS: 0.00284 · 19.8th percentile
Weakness: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published: 2026-03-04T01:55Z

EPSS history

Timeline

04 MAR 01:55Z
Concrete CMS below version 9.4.8 is vulnerable to Stored XSS in Search Results via Page Names
cvelistv5