CVE-2026-8428
- Source
- https://cve.org/CVERecord?id=CVE-2026-8428
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8428.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-8428
- Aliases
- Published
- 2026-05-21T20:24:11.572Z
- Modified
- 2026-07-25T03:56:22.479927152Z
- Severity
-
- 7.5 (High) CVSS_V4 - 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 CVSS Calculator
- Summary
- CSRF token is not validated in the core CMS update controller for Concrete CMS 9.5.0 and below
- Details
-
Concrete CMS 9.5.0 and below emits a CSRF token in the localavailableupdate.php view ($token->output('doupdate')) but the corresponding doupdate() method in concrete/controllers/singlepage/dashboard/system/update/update.php never calls $this->token->validate('doupdate'). 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 DIRCOREUPDATES. 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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8428.json", "cna_assigner": "ConcreteCMS", "cwe_ids": [ "CWE-352", "CWE-829" ] }- References
Affected packages
Git / github.com/concretecms/concretecms
Affected ranges
- Type
- GIT
- Repo
- https://github.com/concretecms/concretecms
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "cpe": "cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*", "source": [ "AFFECTED_FIELD", "CPE_RANGE" ], "extracted_events": [ { "introduced": "5.0" }, { "last_affected": "9.5.0" }, { "introduced": "0" }, { "fixed": "9.5.1" } ] }