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CVE-2026-8428 (GCVE-0-2026-8428)

Vulnerability from cvelistv5 – Published: 2026-05-21 20:24 – Updated: 2026-05-22 13:23
VLAI
Title
CSRF token is not validated in the core CMS update controller for Concrete CMS 9.5.0 and below
Summary
Concrete CMS 9.5.0 and below emits a CSRF token in the local_available_update.php view ($token->output('do_update')) but the corresponding do_update() method in concrete/controllers/single_page/dashboard/system/update/update.php never calls $this->token->validate('do_update'). The form is rendered as a POST form, meaning the token reaches the browser, but because the controller discards it without verification, an attacker can craft a cross-site POST that triggers a core CMS update to an attacker-specified version string.  In order to be vulnerable, theictim must be passing canUpgrade()anda valid update version must be present under DIR_CORE_UPDATES. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 7.5 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks https://github.com/maru1009 for reporting.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-22 13:23 UTC
CWE
  • CWE-352 - Cross-Site request forgery (CSRF)
  • CWE-829 - Inclusion of functionality from untrusted control sphere
References
Impacted products
Vendor Product Version CPE status
Concrete CMS Concrete CMS Affected: 5.0 , ≤ 9.5.0 (git)
guessed Create a notification for this product.
Show details on NVD website

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