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Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676

PUBLISHED Reserved 2026-05-28 | Published 2026-07-13 | Updated 2026-07-13 | Assigner Mattermost




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-862: Missing Authorization

Product status

Default status
unaffected

11.7.0 (semver)
affected

11.6.0 (semver)
affected

10.11.0 (semver)
affected

11.8.0
unaffected

11.7.3
unaffected

11.6.5
unaffected

10.11.20
unaffected

Credits

adamsec-dev finder

References

mattermost.com/security-updates (MMSA-2026-00676) vendor-advisory

cve.org (CVE-2026-9824)

nvd.nist.gov (CVE-2026-9824)

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