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CVE-2026-6347

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CVE-2026-6347

Published: May 18, 2026

Modified: May 18, 2026

PUBLISHED

CVSS v3.1

7.6

HIGH

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields in the Mattermost Calls plugin which allows an attacker with access to a support packet to obtain TURN server credentials via the plaintext values present in the exported plugin configuration.. Mattermost Advisory ID: MMSA-2026-00605

VendorProductVersions

Mattermost

Mattermost

affected
11.5.0 - <= 11.5.1
affected
10.11.0 - <= 10.11.13
affected
11.4.0 - <= 11.4.3
unaffected
11.6.0
unaffected
11.5.2

+2 more versions

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

Low

References

MMSA-2026-00605
vendor-advisory

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