CVE-2026-8327

Concrete CMS below 9.5.0 and below is vulnerable to password change without reauthorization and session-hardening bypass.

State: Published
Severity: 5.3 Medium
Published: May 21, 2026
Updated: May 22, 2026
Reserved: May 11, 2026

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Description

Concrete CMS below 9.5.0 and below is vulnerable to password change without reauthorization and session-hardening bypass. The user-profile edit controller passes the entire raw POST array to UserInfo::update() without field whitelisting resulting in password change without requiring the current password and also resulting in registered users able to disable the per-user-IP-pinning in the session validator which is meant to detect hijacking. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 5.3 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks 0x4c616e for reporting.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N	ConcreteCMS

Weaknesses

CWE-915 Improperly controlled modification of Dynamically-Determined object attributes
CWE-620 Unverified password change
CWE-269 Improper Privilege Management

Affected Products

Product	Versions
Concrete CMSConcrete CMS	5 through 9.5.0Affected

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notesrelease-notes

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