Concrete CMS has a session-hardening bypass and allows password change without reauthorization

中 4.3CVE-2026-8327 · GHSA-wmw3-3fv3-h54w · 21/05/2026 公開 · 23/07/2026 更新

要点

CVE-2026-8327 は concrete5/concrete5, concrete cms (concretecms) に影響する深刻度「中」 (CVSS 4.3) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.18%（全脆弱性の 7.8% より高い）。
対処：9.5.1 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
concrete5/concrete5 Packagist	`< 9.5.1`	`9.5.1`
concrete cms concretecms	`< 9.5.1`	`9.5.1`

概要

Concrete CMS 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.

NVD の説明

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.