CVE WatchSep 16, 2026

CVE-2026-18422

Concrete CMS before 9.5.3 did not enforce a destination-side authorization check and did not validate a CSRF token in the multilingual page

CVSS

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No CVSS

EPSS

0.4%

p31

KEV

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Exploit Today

0-100

Published: Sep 15, 2026 · Last modified: Sep 16, 2026 · CWE-862

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-09-162026-09-19

Technical description

Concrete CMS before 9.5.3 did not enforce a destination-side authorization check and did not validate a CSRF token in the multilingual page assignment backend action (Backend\Page\Multilingual::assign). As a result, an authenticated user who held the Edit Page Multilingual Settings permission on a single page could bind an arbitrary page in another locale as that source page's translation, and could delete legitimate translation pairs maintained by other editors, altering public-facing language routing across the site. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.

Official references

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

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