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Mattermost doesn't sanitize team member data when returned via API to users without elevated permissions

🗓️ 26 May 2026 13:30:15Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 4 Views

Mattermost versions 11.4-11.6 leak team member roles via API to users without elevated permissions.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-3636
22 May 202610:23
attackerkb
Circl
CVE-2026-3636
22 May 202612:53
circl
CNNVD
Mattermost 安全漏洞
22 May 202600:00
cnnvd
CVE
CVE-2026-3636
22 May 202610:23
cve
Cvelist
CVE-2026-3636 Sanitize team member data returned by API
22 May 202610:23
cvelist
EUVD
EUVD-2026-31428
22 May 202610:23
euvd
NVD
CVE-2026-3636
22 May 202611:16
nvd
OSV
GHSA-FFPR-PFR4-G354 Mattermost doesn't sanitize team member data when returned via API to users without elevated permissions
26 May 202613:30
osv
Positive Technologies
PT-2026-42746
22 May 202600:00
ptsecurity
RedhatCVE
CVE-2026-3636
5 Jun 202619:37
redhatcve
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Vulners
Node
mattermostmattermost-serverRange10.11.010.11.15go
OR
mattermostmattermost-serverRange11.4.011.4.5go
OR
mattermostmattermost-serverRange11.5.011.5.4go
OR

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26 Jun 2026 22:48Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.3
EPSS0.00184
SSVC
4