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Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation

🗓️ 22 Jun 2026 15:30:46Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 6 Views

Mattermost through 11.7.0 fails to invalidate WebSocket auth during global session revocation.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-9162
22 Jun 202613:36
attackerkb
circl
Circl
CVE-2026-9162
22 Jun 202616:15
circl
cve
CVE
CVE-2026-9162
22 Jun 202613:36
cve
cvelist
Cvelist
CVE-2026-9162 Global session revocation does not invalidate active WebSocket connections
22 Jun 202613:36
cvelist
euvd
EUVD
EUVD-2026-38247
22 Jun 202613:36
euvd
nvd
NVD
CVE-2026-9162
22 Jun 202614:17
nvd
osv
OSV
GHSA-H998-HXXJ-8Q83 Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation
22 Jun 202615:30
osv
ptsecurity
Positive Technologies
PT-2026-51322
22 Jun 202600:00
ptsecurity
snyk
Snyk
Insufficient Session Expiration
22 Jun 202615:20
snyk
snyk
Snyk
Insufficient Session Expiration
22 Jun 202615:20
snyk
Rows per page
Vulners
Node
OR
mattermostmattermost-serverRange10.11.010.11.18go
mattermostmattermost-serverRange11.5.011.5.6go
mattermostmattermost-serverRange11.6.011.6.3go
mattermostmattermost-serverRange11.7.011.7.1go

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15 Sep 2026 19:51Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.14.3
EPSS0.00334
SSVC
6