High severity7.6NVD Advisory· Published May 18, 2026· Updated Jun 17, 2026
CVE-2026-6347
CVE-2026-6347
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
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost-serverGo | >= 11.5.0, < 11.5.2 | 11.5.2 |
github.com/mattermost/mattermost-serverGo | >= 10.11.0, < 10.11.14 | 10.11.14 |
github.com/mattermost/mattermost-serverGo | >= 11.4.0, < 11.4.4 | 11.4.4 |
github.com/mattermost/mattermost-plugin-callsGo | < 1.12.0-rc2 | 1.12.0-rc2 |
Affected products
5- ghsa-coords3 versionspkg:golang/github.com/mattermost/mattermost-plugin-callspkg:golang/github.com/mattermost/mattermost-serverpkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0
< 1.12.0-rc2+ 2 more
- (no CPE)range: < 1.12.0-rc2
- (no CPE)range: >= 11.5.0, < 11.5.2
- (no CPE)range: < 0.0.20260723T184607-160000.1.1
11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3+ 1 more
- (no CPE)range: 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.11.0,<10.11.14
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-82j6-4fq7-fx62ghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-6347ghsaADVISORY
- github.com/mattermost/mattermost-plugin-calls/commit/d48893c8558e5a61f5fdd188bbee5ec7cb73887bghsaWEB
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