CVE-2026-68528 Details
Description
Concrete CMS RSS Displayer block below version 9.5.3 rendered remote feed item titles without HTML escaping, resulting in stored cross-site scripting. An attacker able to control a title in a syndicated feed could execute script in the site origin for any visitor to the affected page, including administrators, without holding an account on that site. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 6.0 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.
A stored cross-site scripting vulnerability has been identified in the Concrete CMS RSS Displayer block, affecting versions prior to 9.5.3. The issue arises because remote feed item titles were rendered without proper HTML escaping. This flaw allows an attacker to inject scripts into the site, which are executed in the context of the site origin for all visitors to the affected page, including administrators. Notably, the attacker does not need an account on the site to exploit this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 11, 2026CISA-ADP
Assessed Sep 11, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes | ConcreteCMS | Broken LinkRelease NotesVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | ConcreteCMS |
Affected Products
| Product | Versions |
|---|---|
| Concrete CMS | < 9.5.3 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 11, 2026 | CVE Modified | CISA-ADP |
| Sep 11, 2026 | New CVE Received | ConcreteCMS |