CVE-2026-18110 Concrete CMS 9.0.0 through 9.5.2 is vulnerable to missing authorization in the user selector autocomplete endpoint (/ccm/system/user/autocomplete), allowing an unauthenticated attacker to retrieve the complete backend user directory — internal ID, username
| Reporter | Title | Published | Views | Family All 4 |
|---|---|---|---|---|
 | CVE-2026-18110 | 15 Sep 202616:33 | – | cve |
 | EUVD-2026-78830 | 15 Sep 202616:33 | – | euvd |
 | CVE-2026-18110 | 15 Sep 202617:17 | – | nvd |
 | PT-2026-92121 | 15 Sep 202600:00 | – | ptsecurity |
[
{
"vendor": "Concrete CMS",
"product": "Concrete CMS",
"collectionURL": "https://github.com/concretecms/concretecms",
"repo": "https://github.com/concretecms/concretecms",
"versions": [
{
"status": "affected",
"version": "9.0.0",
"lessThanOrEqual": "9.5.2",
"versionType": "git"
}
],
"defaultStatus": "unaffected"
}
]| Source | Link |
|---|---|
| documentation | www.documentation.concretecms.org/developers/introduction/version-history/953-release-notes |
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15 Sep 2026 16:33Current
CVSS 48.7
EPSS0.00247