Concrete CMS before 9.5.3 rendered Express entry labels as raw HTML when displaying associated entries, resulting in stored cross-site scripting. (CVE-2026-68534)
Concrete CMS versions before 9.5.3 contain a stored cross-site scripting (XSS) vulnerability in the rendering of Express entry labels as raw HTML. An unauthenticated attacker can submit malicious payloads via public Express Forms, which execute in administrator dashboards or visitor browsers when viewing associated entries or Express Entry List blocks. This allows actions to be performed with the privileges of the affected user.
AI Analysis
Technical Summary
Concrete CMS before version 9.5.3 improperly renders Express entry labels as raw HTML in associated entries, leading to stored cross-site scripting (CWE-79). An unauthenticated attacker can inject a payload through a public Express Form, which executes in the context of an administrator's dashboard session or any visitor viewing a page with an Express Entry List block that includes association columns. This XSS vulnerability enables execution of arbitrary scripts with the privileges of the user viewing the entry. The Concrete CMS security team assigned a CVSS v4.0 score of 2.3, indicating low severity.
Potential Impact
An attacker can inject malicious scripts that execute in the browsers of administrators or site visitors, potentially allowing unauthorized actions with their privileges. However, the low CVSS score reflects limited impact or exploitability. There are no known exploits in the wild reported.
Mitigation Recommendations
A fix is available in Concrete CMS version 9.5.3. Users should upgrade to version 9.5.3 or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Concrete CMS before 9.5.3 rendered Express entry labels as raw HTML when displaying associated entries, resulting in stored cross-site scripting. (CVE-2026-68534)
Description
Concrete CMS versions before 9.5.3 contain a stored cross-site scripting (XSS) vulnerability in the rendering of Express entry labels as raw HTML. An unauthenticated attacker can submit malicious payloads via public Express Forms, which execute in administrator dashboards or visitor browsers when viewing associated entries or Express Entry List blocks. This allows actions to be performed with the privileges of the affected user.
CVSS v4.0
Affected software
pkg:github/concretecms/concrete5Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Concrete CMS before version 9.5.3 improperly renders Express entry labels as raw HTML in associated entries, leading to stored cross-site scripting (CWE-79). An unauthenticated attacker can inject a payload through a public Express Form, which executes in the context of an administrator's dashboard session or any visitor viewing a page with an Express Entry List block that includes association columns. This XSS vulnerability enables execution of arbitrary scripts with the privileges of the user viewing the entry. The Concrete CMS security team assigned a CVSS v4.0 score of 2.3, indicating low severity.
Potential Impact
An attacker can inject malicious scripts that execute in the browsers of administrators or site visitors, potentially allowing unauthorized actions with their privileges. However, the low CVSS score reflects limited impact or exploitability. There are no known exploits in the wild reported.
Mitigation Recommendations
A fix is available in Concrete CMS version 9.5.3. Users should upgrade to version 9.5.3 or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-qh33-6hmp-jg6p
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-68534"]
- Database Specific Severity
- LOW
- Cvss Version
- 4.0
Threat ID: 6aaa07ef55bf5e2cf5ea4347
Added to database: 09/16/2026, 03:07:27 UTC
Last enriched: 09/16/2026, 04:59:58 UTC
Last updated: 09/17/2026, 01:51:18 UTC
Views: 5
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