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OpenAdvisories
Low · 2.0 CVE-2026-8139 EUVD-2026-31380GHSA-pcrh-gj77-j4mw

Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via external-link page cvName

Published May 21, 2026 · Updated May 22, 2026 · Assigned by ConcreteCMS

Description

Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via external-link page cvName because updateCollectionAliasExternal bypasses being sanitized. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N.  Thanks Yonatan Drori (Tenzai) for reporting.

Affected products

VendorProductAffectedFixed
Concrete CMS Concrete CMS — —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist concrete5/concrete5 < 9.5.1 9.5.1 GHSA-pcrh-gj77-j4mw

References