CVE-2026-6334 — OAuth authorization code client binding not enforced during token redemption in Mattermost
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 authenticat…
Published: 2026-05-18 · CVSS: 3.1 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7