CVE-2026-6347

7.6 HIGH

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 Matter...

Published: 2026-05-18 · Last updated: 2026-05-18

Severity and scoring

CVSS: 7.6 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L
CWE: CWE-200

Affected products

Vendor	Product
mattermost	mattermost_server

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

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-6347
[Vendor advisory]https://mattermost.com/security-updates

Related CVEs

Same vendor

CVE-2026-6957 — Mattermost Plugins versions <=1.1.5 fail to sanitize filenames received from federated peers before using them to construct export destin... (8.0 HIGH)
CVE-2026-4915 — Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to filter nil elements from outgoing w... (6.5 MEDIUM)
CVE-2026-4858 — Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path trav... (8.0 HIGH)
CVE-2026-4055 — Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook r... (4.3 MEDIUM)
CVE-2026-6346 — 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 before includ... (8.7 HIGH)

Same CWE

CVE-2026-49219 — ImageMagick is free and open-source software used for editing and manipulating digital images (5.5 MEDIUM)
CVE-2026-47165 — ImageMagick is free and open-source software used for editing and manipulating digital images (4.1 MEDIUM)
CVE-2026-48855 — Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery
CVE-2026-45329 — ESF-IDF is the Espressif Internet of Things (IOT) Development Framework (7.1 HIGH)
CVE-2026-36719 — An information disclosure vulnerability in the /api/v1/user/info endpoint of AgentChat v2.3.0 allows unauthenticated attackers to obtain ... (7.5 HIGH)