CVE-2026-6334
published 2026-05-18CVE-2026-6334: 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…
low3.8CVSS 3.1
AVNACLPRHUINSUCLILAN
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
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| github.com | mattermost_mattermost-server | >= 0 < 5.3.2-0.20260318173148-e9ae890a013b | 5.3.2-0.20260318173148-e9ae890a013b |
| github.com | mattermost_mattermost_server_v8 | >= 0 < 8.0.0-20260318173148-e9ae890a013b | 8.0.0-20260318173148-e9ae890a013b |
| github.com | mattermost_mattermost_server_v8 | >= 10.11.0 < 10.11.14 | 10.11.14 |
| github.com | mattermost_mattermost_server_v8 | >= 11.5.0 < 11.5.2 | 11.5.2 |
| mattermost | mattermost | 10.11.0 – 10.11.13 | — |
| mattermost | mattermost | 11.5.0 – 11.5.1 | — |
| mattermost | mattermost_server | >= 10.11.0 < 10.11.14 | 10.11.14 |
| mattermost | mattermost_server | >= 11.5.0 < 11.5.2 | 11.5.2 |