Mattermost <11.0.2, 10.12.1, 10.11.4, 10.5.12 - Auth Bypass
Title source: llmExploitation Summary
EIP tracks 1 public exploit for CVE-2025-12421. PoCs published by exploitintel.
AI-analyzed exploit summary This repository contains a functional exploit for CVE-2025-12421, demonstrating a token type confusion vulnerability in Mattermost Server that allows account takeover via crafted tokens. The PoC includes detailed technical analysis, lab setup, and two Python scripts that exploit the vulnerability.
Description
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).
Exploits (1)
This repository contains a functional exploit for CVE-2025-12421, demonstrating a token type confusion vulnerability in Mattermost Server that allows account takeover via crafted tokens. The PoC includes detailed technical analysis, lab setup, and two Python scripts that exploit the vulnerability.
References (1)
Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
