CVE-2026-8327CWE-269CWE-620CWE-915

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

Medium · published May 21, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
22.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
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
EPSS
0.00305 · 22.0th percentile
Weaknesses
CWE-269 · Improper Privilege Management; CWE-620 · Unverified Password Change; CWE-915 · Improperly Controlled Modification of Dynamically-Determined Object Attributes
Published
2026-05-21T21:15Z
EPSS history
Timeline
  • 21 MAY 21:15Z
    Concrete CMS below 9.5.0 and below is vulnerable to password change without reauthorization and session-hardening bypass.
    cvelistv5