CVE-2026-81921: concretecms concrete cms

csirt@kutim:~/threat-intel/cve/CVE-2026-81921

CVSS 5.4 · Medium EPSS 0,24%

Kerentanan Missing Authorization pada concretecms concrete cms. Skor CVSS 3.1 5.4 (Medium) menurut NVD.

Deskripsi (NVD)

Concrete CMS 8.5.3 through 9.5.2 enabled the OAuth 2.0 refresh-token grant using the unmodified upstream League grant, which issued new access tokens from a valid refresh token without re-checking the associated account's active status. A user who obtained a refresh token while active could therefore continue to mint valid access tokens after being deactivated or suspended (uIsActive=0), so deactivating an account did not revoke its API access. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L. Thanks sh4d0byss for reporting.

Rincian

Terbit di NVD: 15 September 2026
Terakhir diubah: 18 September 2026
Status NVD: Analyzed
CVSS 3.1: 5.4 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-862: Missing Authorization
EPSS (30 hari): 0,24% peluang dieksploitasi; lebih tinggi dari 13,7% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
concretecms	concrete cms	Versi 8.5.3 hingga sebelum 9.5.3

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes broken link

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:11 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.