Mattermost Server mishandles redirect denial action

GHSA-f7c3-7vp3-44p6 · CVE-2017-18897 · GO-2026-4301

Published May 24, 2022 · Modified Feb 3, 2026

Description

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5, when used as an OAuth 2.0 service provider. It mishandles a deny action for a redirection.

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2017-18897
WEB https://github.com/mattermost/mattermost/commit/3c34e2b2dcb0fde96a10e68d877aa7d0ab511669
WEB https://github.com/mattermost/mattermost/commit/722fb1947a2e7395ccf16adce9206736d803a9f3
WEB https://github.com/mattermost/mattermost/commit/d38328976e2c8bb0fab91e656042a0d8ac37bc76
PACKAGE https://github.com/mattermost/mattermost
WEB https://mattermost.com/security-updates

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