In Concrete CMS CVE-2026-81923

Q: What is the CVSS score of CVE-2026-81923?

CVE-2026-81923 has a CVSS 4.0 base score of 2.1 (Low). CVSS 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/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.

EUVD-2026-79294 LOW

Missing Authorization (CWE-862)

2026-09-15 ff5b8ace-8b95-4078-9743-eac1ca5451de

GHSA-4q84-hvmx-qpr3

Authentication Bypass CSRF

2.1

CVSS 4.0 · Vendor: ff5b8ace-8b95-4078-9743-eac1ca5451de

Severity by source

Vendor (ff5b8ace-8b95-4078-9743-eac1ca5451de) PRIMARY

2.1 LOW

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/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

Primary rating from Vendor (ff5b8ace-8b95-4078-9743-eac1ca5451de) · only source for this CVE.

CVSS VectorVendor: ff5b8ace-8b95-4078-9743-eac1ca5451de

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Sep 15, 2026 - 19:31 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Concrete CMS versions before 9.5.3 contain a missing-authorization flaw in the SEO Bulk Update Meta Tags editor: the saveRecord() action validated the per-page CSRF token but never invoked canEditPageProperties() for the target page. As a result, an authenticated user who was granted access to the bulk SEO tool and could merely view a page could rewrite that page's meta title, meta description, and URL handle, tampering with presentation content and live URLs outside their intended edit scope. …