CVE-2018-21263

HIGH

Mattermost Server < 4.7.0, < 4.6.2, < 4.5.2 - Unauthenticated Account Takeover via SAML Response

Title source: llm

Description

An issue was discovered in Mattermost Server before 4.7.0, 4.6.2, and 4.5.2. An attacker could authenticate to a different user's account via a crafted SAML response.

References (1)

Core 1

Core References

Vendor Advisory x_refsource_confirm

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

Scores

CVSS v3 8.8

EPSS 0.0034

EPSS Percentile 56.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-287

Status published

Products (2)

mattermost/mattermost_server 4.7.0 rc1 (4 CPE variants)

mattermost/mattermost_server < 4.5.2

Published Jun 19, 2020

Tracked Since Feb 18, 2026