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CVE-2026-6334

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CVE-2026-6334

Published: May 18, 2026

Modified: May 18, 2026

PUBLISHED

CVSS v3.1

3.1

LOW

Description

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

VendorProductVersions

Mattermost

Mattermost

affected
11.5.0 - <= 11.5.1
affected
10.11.0 - <= 10.11.13
unaffected
11.6.0
unaffected
11.5.2
unaffected
10.11.14

Weaknesses (CWE)

CWE-305

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

References

MMSA-2026-00570
vendor-advisory

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