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Mattermost doesn't enforce slash command trigger-word uniqueness during command updates

🗓️ 18 May 2026 09:31:48Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 3 Views

Mattermost does not enforce slash command trigger-word uniqueness on updates, enabling hijacking.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-28732
18 May 202608:35
attackerkb
CNNVD
Mattermost 安全漏洞
18 May 202600:00
cnnvd
CVE
CVE-2026-28732
18 May 202608:35
cve
Cvelist
CVE-2026-28732 Slash command trigger-word update allowed command hijacking
18 May 202608:35
cvelist
EUVD
EUVD-2026-30760
18 May 202608:35
euvd
NVD
CVE-2026-28732
18 May 202609:16
nvd
OSV
GHSA-WVCV-9XPM-7MQC Mattermost doesn't enforce slash command trigger-word uniqueness during command updates
18 May 202609:31
osv
Positive Technologies
PT-2026-41649
18 May 202600:00
ptsecurity
Snyk
Incorrect Authorization
18 May 202611:47
snyk
Snyk
Incorrect Authorization
18 May 202611:47
snyk
Rows per page
Vulners
Node
mattermostmattermost-serverRange<5.3.2-0.20260306123948-f5fe8ded6b63go
OR
mattermostmattermostRange<8.0.0-20260306123948-f5fe8ded6b63go
OR
mattermostmattermostRange11.4.011.4.4go
OR
mattermostmattermostRange10.11.010.11.14go
OR
mattermostmattermostRange11.5.011.5.2go

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01 Jun 2026 15:13Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.3
EPSS0.00031
SSVC
3