CVE-2025-8571
MEDIUMConcretecms Concrete Cms < 8.5.21 - XSS
Title source: ruleDescription
Concrete CMS 9 to 9.4.2 and versions below 8.5.21 are vulnerable to Reflected Cross-Site Scripting (XSS) in the Conversation Messages Dashboard Page. Unsanitized input could cause theft of session cookies or tokens, defacement of web content, redirection to malicious sites, and (if victim is an admin), the execution of unauthorized actions. 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:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Fortbridge https://fortbridge.co.uk/ for performing a penetration test and vulnerability assessment on Concrete CMS and reporting this issue.
Exploits (1)
Scores
CVSS v3
4.8
EPSS
0.0010
EPSS Percentile
27.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Details
CWE
CWE-20
CWE-79
Status
published
Products (2)
concrete5/concrete5
0 - 8.5.21Packagist
concretecms/concrete_cms
< 8.5.21
Published
Aug 05, 2025
Tracked Since
Feb 18, 2026