CVE-2025-8571
MEDIUM EPSS 22.1%
Published Aug 5, 202510mo ago · Modified Jun 17, 20262w ago
4.8 CVSS 4.0
Published Aug 5, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago
Description
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/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 Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction P
Scope X
Threat Intelligence
EPSS Exploit Probability
22.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 2
CWE-20 Improper Input Validation Validation
CWE-79 Cross-site Scripting Injection
Affected Products 2
| Vendor | Product | Version | Range |
|---|---|---|---|
| concretecms | concrete_cms | * | <8.5.21 |
| concretecms | concrete_cms | * | ≥9.0 – <9.4.3 |
References 3
- documentation.concretecms.org https://documentation.concretecms.org/9-x/developers/introduction/version-history/943-release-notes
- documentation.concretecms.org https://documentation.concretecms.org/developers/introduction/version-history/8521-release-notes
- concretecms.org https://www.concretecms.org/download
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.