What is GHSA-46mx-9v73-g459?

GHSA-46mx-9v73-g459 is a security advisory published by GitHub Security Advisories with Low severity. Concrete CMS 8.5.3 through 9.5.2 enabled the OAuth 2.0 refresh-token grant using the unmodified...

Which CVE IDs does GHSA-46mx-9v73-g459 cover?

GHSA-46mx-9v73-g459 covers the following CVE IDs: CVE-2026-81921. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-46mx-9v73-g459?

GHSA-46mx-9v73-g459 has a CVSS v3 base score of 5.4, published by GitHub Security Advisories.

GHSA-46mx-9v73-g459LowCVSS 5.4

Concrete CMS 8.5.3 through 9.5.2 enabled the OAuth 2.0 refresh-token grant using the unmodified...

Vendor

GitHub Security Advisories

Published

September 15, 2026

Last Modified

September 18, 2026

🔗 CVE IDs covered (1)

CVE-2026-81921 →

📋 Description

Concrete CMS 8.5.3 through 9.5.2 enabled the OAuth 2.0 refresh-token grant using the unmodified upstream League grant, which issued new access tokens from a valid refresh token without re-checking the associated account's active status. A user who obtained a refresh token while active could therefore continue to mint valid access tokens after being deactivated or suspended (uIsActive=0), so deactivating an account did not revoke its API access. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L. Thanks sh4d0byss for reporting.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-81921
https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes
https://github.com/advisories/GHSA-46mx-9v73-g459