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Mattermost allows a removed team member to enumerate all public channels within a private team

🗓️ 16 Mar 2026 15:30:43Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 39 Views

Removed team member can enumerate public channels in a private team due to search API validation flaw.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-2458
16 Mar 202611:27
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost Authentication Bypass
13 May 202600:00
–bdu_fstec
circl
Circl
CVE-2026-2458
16 Feb 202600:00
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
16 Mar 202600:00
–cnnvd
cve
CVE
CVE-2026-2458
16 Mar 202611:27
–cve
cvelist
Cvelist
CVE-2026-2458 Unauthorized channel enumeration in private teams after member removal
16 Mar 202611:27
–cvelist
euvd
EUVD
EUVD-2026-12409
16 Mar 202615:30
–euvd
mend
Mend
CVE-2026-2458
16 Mar 202611:27
–mend
nvd
NVD
CVE-2026-2458
16 Mar 202614:19
–nvd
osv_ghsa
osv_ghsa
GHSA-679F-WMRG-QF57 Mattermost allows a removed team member to enumerate all public channels within a private team
16 Mar 202615:30
–osv_ghsa
Rows per page
Vulners
Node
OR
mattermostmattermost-serverRange11.3.0-rc1–11.3.1go
mattermostmattermost-serverRange11.2.0-rc1–11.2.3go
mattermostmattermost-serverRange10.11.0-rc1–10.11.11go
mattermostmattermost-serverRange<5.3.2-0.20260113182106-a18b80ba4c32go
mattermostmattermostRange<8.0.0-20260113182106-a18b80ba4c32go

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17 Mar 2026 20:01Current
6.2Medium risk
Vulners AI Score6.2
CVSS 3.14.3
EPSS0.00168
SSVC
39