CVE-2026-6347 json
Mattermost Calls plugin exposes TURN server credentials in plaintext in support packets
published 2026-05-18 5 mo ago modified 2026-10-14 25 d ago also GHSA-82j6-4fq7-fx62 , GO-2026-5238 , EUVD-2026-30752
- cvss
- 7.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
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
Patch / fix
- go github.com/mattermost/mattermost-server 10.11.14, 10.11.14+incompatible, 11.4.4, 11.4.4+incompatible, 11.5.2, 11.5.2+incompatible
- go github.com/mattermost/mattermost-plugin-calls 1.12.0-rc2
- Mattermost Mattermost 10.11.14, 11.4.4, 11.5.2, 11.6.0
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L |
| GitHub | 3.1 | 7.6 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >=11.5.0, <11.5.2 >=10.11.0, <10.11.14 >=11.4.0, <11.4.4 >=10.11.0+incompatible, <10.11.14+incompatible >=11.4.0+incompatible, <11.4.4+incompatible >=11.5.0+incompatible, <11.5.2+incompatible |
11.5.2 10.11.14 11.4.4 10.11.14+incompatible 11.4.4+incompatible 11.5.2+incompatible |
| go | github.com/mattermost/mattermost-plugin-calls | <1.12.0-rc2 |
1.12.0-rc2 |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
github.com
/mattermost/mattermost-plugin-calls/commit/d48893c8558e5a61f5fdd188bbee5ec7cb73887b
web, patch
-
mattermost.com
/security-updates
vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-6347
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-82j6-4fq7-fx62
advisory
Sources
- CVE List CVE-2026-6347
- GitHub Advisory GHSA-82j6-4fq7-fx62
- NVD CVE-2026-6347
- OSV GO-2026-5238
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.