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CVE-2026-6347GHSA-82J6-4FQ7-FX62GO-2026-5238

Mattermost Calls plugin exposes TURN server credentials in plaintext in support packets

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 11.5.2, 10.11.14, 11.4.4, 1.12.0-rc2, 10.11.14+incompatible, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Mattermost Mattermost

    From 11.5.0 · through 11.5.1; From 10.11.0 · through 10.11.13; From 11.4.0 · through 11.4.3

  • github.com/mattermost/mattermost-serverGo

    From 11.5.0 · fixed in 11.5.2

  • github.com/mattermost/mattermost-serverGo

    From 10.11.0 · fixed in 10.11.14

  • github.com/mattermost/mattermost-serverGo

    From 11.4.0 · fixed in 11.4.4

  • github.com/mattermost/mattermost-plugin-callsGo

    fixed in 1.12.0-rc2

  • github.com/mattermost/mattermost-serverGo

    From 10.11.0+incompatible · fixed in 10.11.14+incompatible; From 11.4.0+incompatible · fixed in 11.4.4+incompatible; From 11.5.0+incompatible · fixed in 11.5.2+incompatible

References 1

mattermost.com