CVE-2025-8571

Concrete CMS 9 through 9.4.2 and below 8.5.21 is vulnerable to Reflected Cross-Site Scripting (XSS) in Conversation Messages Dashboard Page

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.

Category

4.8
CVSS
Severity: Medium
CVSS 4.0 •
EPSS 0.11%
Affected: Concrete CMS Concrete CMS
Published at:
Updated at:

References

Link Tags
https://documentation.concretecms.org/developers/introduction/version-history/8521-release-notes
https://documentation.concretecms.org/9-x/developers/introduction/version-history/943-release-notes
https://www.concretecms.org/download

Frequently Asked Questions

What is the severity of CVE-2025-8571?
CVE-2025-8571 has been scored as a medium severity vulnerability.
How to fix CVE-2025-8571?
To fix CVE-2025-8571, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-8571 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-8571 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-8571?
CVE-2025-8571 affects Concrete CMS Concrete CMS.
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