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CVE-2026-8426 Concrete CMS 9.5.0 and below is vulnerable to CSRF on prepare_remote_upgrade() leading to one-request RCE via package overwrite
| Reporter | Title | Published | Views | Family All 11 |
|---|---|---|---|---|
 | CVE-2026-8426 | 21 May 202620:22 | – | attackerkb |
 | Concrete CMS 跨站请求伪造漏洞 | 21 May 202600:00 | – | cnnvd |
 | CVE-2026-8426 | 21 May 202620:22 | – | cve |
 | EUVD-2026-31337 | 21 May 202620:22 | – | euvd |
 | Concrete CMS does not validate a CSRF token before processing requests to `/dashboard/extend/update/prepare_remote_upgrade/<remoteMPID>` | 21 May 202621:30 | – | github |
 | CVE-2026-8426 | 21 May 202621:16 | – | nvd |
 | GHSA-5RJ5-GFMR-HRC3 Concrete CMS does not validate a CSRF token before processing requests to `/dashboard/extend/update/prepare_remote_upgrade/<remoteMPID>` | 21 May 202621:30 | – | osv |
 | PT-2026-42548 | 21 May 202600:00 | – | ptsecurity |
 | CVE-2026-8426 | 5 Jun 202619:10 | – | redhatcve |
 | Cross-site Request Forgery (CSRF) | 21 May 202621:30 | – | snyk |
10
[
{
"vendor": "Concrete CMS",
"product": "Concrete CMS",
"collectionURL": "https://github.com/concretecms/concretecms",
"repo": "https://github.com/concretecms/concretecms",
"versions": [
{
"status": "affected",
"version": "5.0",
"lessThanOrEqual": "9.5.0",
"versionType": "git"
}
],
"defaultStatus": "unaffected"
}
]Data
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21 May 2026 20:22Current
CVSS 47.5
EPSS0.00171