CVE-2025-12421: mattermost server

csirt@kutim:~/threat-intel/cve/CVE-2025-12421

CVSS 9.9 · Critical EPSS 0,35%

Kerentanan Incorrect Implementation of Authentication Algorithm pada mattermost server. Skor CVSS 3.1 9.9 (Critical) menurut mattermost.com.

Deskripsi (NVD)

Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled).

Rincian

Terbit di NVD: 27 November 2025
Terakhir diubah: 17 Juni 2026
Status NVD: Analyzed
CVSS 3.1: 9.9 (Critical), sumber mattermost.com
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-303: Incorrect Implementation of Authentication Algorithm
EPSS (30 hari): 0,35% peluang dieksploitasi; lebih tinggi dari 26,1% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
mattermost	mattermost server	Versi 10.5.0 hingga sebelum 10.5.13
mattermost	mattermost server	Versi 10.11.0 hingga sebelum 10.11.5
mattermost	mattermost server	Versi 10.12.0 hingga sebelum 10.12.2
mattermost	mattermost server	Versi 11.0.0 hingga sebelum 11.0.3

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://mattermost.com/security-updates advisory vendor

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.