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CVE-2026-21386

🗓️ 26 Mar 2026 15:12:37Reported by redhat.comType 
redhatcve
 redhatcve
🔗 access.redhat.com👁 18 Views

Mattermost inconsistent error responses for the /mute command allow authorized members to enumerate private channels.

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Refs
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attackerkb
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CVE-2026-21386
16 Mar 202614:51
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13 May 202600:00
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16 Mar 202600:00
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16 Mar 202614:51
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cvelist
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CVE-2026-21386 Private channel enumeration via /mute slash command
16 Mar 202614:51
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euvd
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EUVD-2026-12437
16 Mar 202615:30
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github
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Mattermost fails to use consistent error responses when handling the /mute command
16 Mar 202615:30
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mend
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nvd
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CVE-2026-21386
16 Mar 202615:16
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osv_ghsa
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GHSA-5MR9-CRCG-8WH2 Mattermost fails to use consistent error responses when handling the /mute command
16 Mar 202615:30
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26 Mar 2026 15:12Current
6.4Medium risk
Vulners AI Score6.4
CVSS 3.14.3
EPSS0.00187
SSVC
18