CVE-2026-7887: For Concrete CMS 9.5.0 and below, OAuth 2.0 Authorization-Code Handler Bypasses Account Status
For Concrete CMS 9.5.0 and below, OAuth 2.0 Authorization-Code Handler Bypasses Account Status. A user with uIsActive=0 (suspended, banned, terminated employee) can still authenticate via OAuth and receive valid API tokens. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N. Thanks 0x4c616e for reporting.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-7887?
The severity of CVE-2026-7887 is classified as low with a CVSS score of 4.0.
How do I fix CVE-2026-7887?
To address CVE-2026-7887, upgrade Concrete CMS to version 9.5.1 or later.
What does CVE-2026-7887 exploit?
CVE-2026-7887 exploits the OAuth 2.0 Authorization-Code Handler allowing suspended users to authenticate.
Who is affected by CVE-2026-7887?
CVE-2026-7887 affects users of Concrete CMS version 9.5.0 and below.
What could be the impact of CVE-2026-7887?
The impact of CVE-2026-7887 could allow unauthorized access to system features by inactive users.