GHSA-jp3f-x449-4q75
Mattermost doesn't enforce client identity binding during the OAuth authorization code redemption flow
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost/server/v8 | >= 11.5.0, < 11.5.2 | 11.5.2 |
| Go | github.com/mattermost/mattermost/server/v8 | >= 10.11.0, < 10.11.14 | 10.11.14 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260318173148-e9ae890a013b | 8.0.0-20260318173148-e9ae890a013b |
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20260318173148-e9ae890a013b | 5.3.2-0.20260318173148-e9ae890a013b |
Details
As written in the advisory (Markdown source, shown as plain text).
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce client identity binding during the OAuth authorization code redemption flow which allows an authenticated OAuth client to redeem authorization codes issued to a different client via a crafted token exchange request.. Mattermost Advisory ID: MMSA-2026-00570
References
External links from the advisory. They lead to third-party sites.