CVE-2026-68528

MediumCVSS 6.0/10Last modified Sep 11, 2026

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.

Metrics

CVSS 4.0 6.0/10

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/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

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
Concrete CMS	Concrete CMS	>= 5.0.0, <= 9.5.2

References

https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes

Timeline

Published: Sep 11, 2026
Last modified: Sep 11, 2026
NVD status: Deferred

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