CVE-2017-18884: Mattermost Server exposes OAuth personal access tokens to attackers

May 24, 2022 (updated December 5, 2025)

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

github.com/advisories/GHSA-876j-jfqf-m7j7
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2017-18884

Code Behaviors & Features

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