Fiche vulnérabilité
CVE-2026-81901 : faille élevée concretecms concrete cms (CVSS 8.7)
Description
In Concrete CMS 9.2.0 through 9.5.2, the REST API page update endpoint (PUT /ccm/api/1.0/pages/{cID}) did not enforce page-property, page-template, or page-type authorization. A user granted only content-editing rights on a page could therefore alter its properties, template, and type through the API, and could set the header_extra_content attribute, which is rendered unescaped into the head element of every page, to persist JavaScript that executed in the browser of every visitor, including higher-privileged reviewers who approve the page version. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.2 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai for reporting.
En bref
- Sévérité
- Élevée (CVSS 8.7)
- Vecteur CVSS
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- Exploitation active
- Non signalée par la CISA
- Publication
- 14 sept. 2026
- Dernière mise à jour
- 18 sept. 2026
Produits concernés
- concretecms concrete cms