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CVE-2026-81923

Concrete CMS below 9.5.3 is missing authorization in the SEO Bulk Update Meta Tags editor

CVSS 4.0 2.1 LOWCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-81923

Published

In Concrete CMS before 9.5.3, the SEO Bulk Update Meta Tags editor did not check per-page edit permissions before saving. The saveRecord() action validated the per-page CSRF token but never called canEditPageProperties() for the target page, so a user who was granted access to the bulk SEO tool and could view (but not edit) a given page was able to change that page's meta title, meta description, and URL handle outside their edit scope, tampering with the presentation and live URLs of otherwise protected content. 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:N/SC:N/SI:N/SA:N. Thanks Andrew Gonzalez for reporting.

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Affected versions, risk and source history

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23 Oct 2026 15:48:27 UTC

Concrete CMS below 9.5.3 is missing authorization in the SEO Bulk Update Meta Tags editor

cve-program · CVE-2026-81923 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 13 Nov 13:11 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current

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