CVE-2026-7887

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.

CVSS v3 6.4 MEDIUM

6.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.1 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes	Release Notes

Configurations

Configuration 1 (hide)

cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*

History

23 Jul 2026, 16:10

Type	Values Removed	Values Added
Summary		(es) Para Concrete CMS 9.5.0 y versiones anteriores, el gestor de código de autorización OAuth 2.0 omite el estado de la cuenta. Un usuario con uIsActive=0 (suspendido, prohibido, empleado despedido) aún puede autenticarse a través de OAuth y recibir tokens de API válidos. El equipo de seguridad de Concrete CMS otorgó a esta vulnerabilidad una puntuación CVSS v.4.0 de 2.3 con el 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. Gracias a 0x4c616e por informar.

22 May 2026, 19:21

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.4
CPE		cpe:2.3:a:concretecms:concrete_cms::::::::
First Time		Concretecms concrete Cms Concretecms
References	~~() https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes -~~	() https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes - Release Notes

21 May 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-21 22:16

Updated : 2026-07-23 16:10

NVD link : CVE-2026-7887

Mitre link : CVE-2026-7887

CVE.ORG link : CVE-2026-7887

JSON object : View

Products Affected

concretecms

concrete_cms

CWE

CWE-1287

Improper Validation of Specified Type of Input

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