PT-2026-42577 · Unknown · Concrete Cms

Yonatan Drori · Published 2026-05-21 · Updated 2026-05-22 · CVE-2026-8435

Positive Technologies (AI Summary)

CVSS v4.0

2.3

Low

Base vector

AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.0 through 9.4.x

Description Cross Site Request Forgery (CSRF) occurs at the 'concrete/controllers/backend/file' endpoint within the approveVersion() function. CSRF is a flaw that allows an attacker to induce a user to perform actions they did not intend to do.

Recommendations Update to version 9.5.0. As a temporary workaround, restrict access to the approveVersion() function in the 'concrete/controllers/backend/file' endpoint.

Fix

CSRF

Weakness Enumeration

CWE-352

CWE-1275

Related Identifiers

CVE-2026-8435

Affected Products

Concrete Cms

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-8435 · Security Note
• https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes · Note
• https://twitter.com/CVEnew/status/2057783209589358942 · Twitter Post
• https://t.me/CVEtracker/54575 · Telegram Post
• https://t.me/cveNotify/164643 · Telegram Post
• https://twitter.com/infoflowcloud/status/2057785037194412182 · Twitter Post