CVE-2026-8327

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.

PUBLISHED Reserved 2026-05-11 | Published 2026-05-21 | Updated 2026-05-22 | Assigner ConcreteCMS

Problem types

CWE-915 Improperly controlled modification of Dynamically-Determined object attributes

CWE-620 Unverified password change

CWE-269 Improper Privilege Management

Product status

Credits

0x4c616e finder

References

documentation.concretecms.org/...n-history/951-release-notes release-notes

cve.org (CVE-2026-8327)

nvd.nist.gov (CVE-2026-8327)

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