Mattermost Server exposes OAuth personal access tokens to attackers

GHSA-876j-jfqf-m7j7 · CVE-2017-18884 · GO-2025-4197

Published May 24, 2022 · Modified Dec 9, 2025

Description

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to gain privileges by using a registered OAuth application with personal access tokens.

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2017-18884
WEB https://mattermost.com/security-updates

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