7.5

CVE-2026-5740

Unauthenticated WebSocket binary frame causes denial of service in Mattermost Server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to properly validate msgpack-encoded WebSocket frames before memory allocation which allows an unauthenticated remote attacker to crash the server process and cause a full service outage for all users via a crafted binary WebSocket message sent to the public WebSocket endpoint.. Mattermost Advisory ID: MMSA-2026-00647
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerMattermost
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Produkt Mattermost
Default Statusunaffected
Version <= 11.6.0
Version 11.6.0
Status affected
Version <= 11.5.3
Version 11.5.0
Status affected
Version <= 11.4.4
Version 11.4.0
Status affected
Version <= 10.11.14
Version 10.11.0
Status affected
Version 11.7.0
Status unaffected
Version 11.6.1
Status unaffected
Version 11.5.4
Status unaffected
Version 11.4.5
Status unaffected
Version 10.11.15
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.33% 0.244
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
9302f53e-dde5-4bf3-b2f2-a83f91ac0eee 7.5 0 0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
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