Summary
Ein Angreifer kann mehrere Schwachstellen in Mattermost Server ausnutzen, um Daten zu manipulieren, Sicherheitsmaßnahmen zu umgehen oder andere, nicht näher spezifizierte Angriffe durchzuführen.
Product
Mattermost ist ein webbasierter Instant-Messaging-Dienst.
Vulnerabilities 4
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Medium 6.5
Mattermost Server Denial of Service via Animated GIF Emoji Upload
Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 fail to limit the number of frames and enforce the file size cap on animated GIF uploads, which allows an authenticated attacker to cause a denial of service via a c…
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Medium 5.4
Client4 fails to validate path parameters
The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing pat…
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Medium 5.4
Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-l…
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Medium 4.3
Denial of service via unbounded document content extraction in Mattermost Server
Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to bound the time and resource consumption of server-side document content extraction which allows an authenticated user with file-upload permission to degrade …
Revision history
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#4
CVE's ergänzt
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#3
Korrektur
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#2
CVE ergänzt
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#1
Initiale Fassung
References
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Mattermost vom 2026-06-28
https://mattermost.com/security-updates/