Concretecms: >> Concrete Cms >> 8.5.19 Security Vulnerabilities
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
CVSS Score
4.8
EPSS Score
0.002
Published
2026-03-04
Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to unserialize() without class restrictions or integrity checks. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 8.9 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H. Thanks YJK ( @YJK0805 https://hackerone.com/yjk0805 ) of ZUSO ART https://zuso.ai/ for reporting.
CVSS Score
8.9
EPSS Score
0.006
Published
2026-03-04
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 Score
4.8
EPSS Score
0.003
Published
2025-08-05
Concrete CMS version 9 below 9.4.0RC2 and versions below 8.5.20 are vulnerable to CSRF and XSS in the Concrete CMS Address attribute because addresses are not properly sanitized in the output when a country is not specified. Attackers are limited to individuals whom a site administrator has granted the ability to fill in an address attribute. It is possible for the attacker to glean limited information from the site but amount and type is restricted by mitigating controls and the level of access of the attacker. Limited data modification is possible. The dashboard page itself could be rendered unavailable.
The fix only sanitizes new data uploaded post update to Concrete CMS 9.4.0RC2. Existing database entries added before the update will still be “live” if there were successful exploits added under previous versions; a database search is recommended. The Concrete CMS security team gave this vulnerability CVSS v.4.0 score of 5.1 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L Thanks Myq Larson for reporting.
CVSS Score
5.1
EPSS Score
0.002
Published
2025-04-03
Concrete CMS (previously concrete5) in versions 9.0 through 9.1.3 is vulnerable to Stored XSS via a container name.
CVSS Score
5.4
EPSS Score
0.005
Published
2023-04-28
Concrete CMS (previously concrete5) versions 8.5.12 and below, and 9.0 through 9.1.3 does not have Secure and HTTP only attributes set for ccmPoll cookies.
CVSS Score
5.3
EPSS Score
0.006
Published
2023-04-28
Concrete CMS (previously concrete5) versions 8.5.12 and below, and 9.0 through 9.1.3 is vulnerable to possible Auth bypass in the jobs section.
CVSS Score
3.3
EPSS Score
0.008
Published
2023-04-28
Concrete CMS (previously concrete5) in versions 9.0 through 9.1.3 is vulnerable to Stored XSS on Saved Presets on search.
CVSS Score
5.4
EPSS Score
0.006
Published
2023-04-28
Concrete CMS (previously concrete5) versions 8.5.12 and below, and versions 9.0 through 9.1.3 is vulnerable to Reflected XSS on the Reply form because msgID was not sanitized.
CVSS Score
6.1
EPSS Score
0.006
Published
2023-04-28
Concrete CMS (previously concrete5) in versions 9.0 through 9.1.3 is vulnerable to Stored XSS on Tags on uploaded files.
CVSS Score
5.4
EPSS Score
0.005
Published
2023-04-28