CVE-2026-81912
Received Received - Intake

Cross-Site Request Forgery in Concrete CMS

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: ConcreteCMS

Description
Concrete CMS before 9.5.3 is vulnerable to Cross-Site Request Forgery in the Move Multiple Groups feature. The dashboard/users/groups/bulkupdate/confirm() endpoint moved the selected group tree nodes without validating an action token, so a state-changing group move could be processed for an authenticated user who did not initiate it. Because relocating a group under a new parent causes that group's members to inherit the parent's permissions, a forged move can change effective authorization. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.7 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-11
Last Modified
2026-09-11
Generated
2026-09-12
AI Q&A
2026-09-12
EPSS Evaluated
N/A
NVD
CVE-2026-81912
EUVD
EUVD-2026-76243

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
concrete_cms concrete_cms to 9.5.3 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-352 The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

Concrete CMS versions before 9.5.3 have a Cross-Site Request Forgery (CSRF) vulnerability in the Move Multiple Groups feature. The endpoint dashboard/users/groups/bulkupdate/confirm() allows moving group tree nodes without validating an action token. This means an authenticated user could be tricked into allowing unauthorized group relocations, which may change permissions for group members.

Impact Analysis

An attacker could exploit this to move groups to different locations in the hierarchy, causing members to inherit unintended permissions from their new parent group. This could lead to unauthorized access to sensitive areas or data within Concrete CMS.

Mitigation Strategies

Upgrade Concrete CMS to version 9.5.3 or later to address the Cross-Site Request Forgery vulnerability in the Move Multiple Groups feature.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-81912. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart