PT-2026-42537 · Unknown · Concrete Cms

Maru1009 · Published 2026-05-21 · Updated 2026-05-21 · CVE-2026-8417

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1

Description Concrete CMS fails to validate a Cross-Site Request Forgery (CSRF) token—a unique identifier used to prevent unauthorized commands from being transmitted from a user the web application trusts—before processing requests to the '/dashboard/extend/update/do update/' endpoint. The do update() function in 'concrete/controllers/single page/dashboard/extend/update.php' only verifies the canInstallPackages() condition before executing upgradeCoreData() and upgrade() on the specified package controller. Since this endpoint is a state-changing GET route without token enforcement, an attacker can trick an authenticated administrator into triggering a package upgrade through cross-site navigation, provided the administrator passes the canInstallPackages() check and the target package is already installed.

Recommendations Update to a version newer than 9.5.0.

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2026-8417

Affected Products

Concrete Cms

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-8417 · Security Note
• https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes · Note
• https://t.me/CVEtracker/54554 · Telegram Post