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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
Base Score
3.1
| Base Score | 3.1 |
|---|---|
| Vector String | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N |
| Base Severity | Low |
| Version | 3.1 |
| Attack Vector (AV) | NETWORK |
