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Unrated severityOSV Advisory· Published Jul 13, 2026· Updated Jul 13, 2026

Remote cluster metadata enumeration via /share-channel autocomplete

CVE-2026-9824

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

Affected products

2
  • Mattermost/MattermostOSV2 versions
    v10.11.19, v11.6.4, v10.11.19-rc1, …+ 1 more
    • (no CPE)range: v10.11.19, v11.6.4, v10.11.19-rc1, …
    • (no CPE)range: <=11.7.2, <=11.6.4, <=10.11.19

Patches

Vulnerability mechanics

References

1

News mentions

0

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