Summary
Ein Angreifer kann mehrere Schwachstellen in Mattermost Server ausnutzen, um Informationen offenzulegen, Sicherheitsmaßnahmen zu umgehen oder Code auszuführen.
Product
Mattermost ist ein webbasierter Instant-Messaging-Dienst.
Vulnerabilities 6
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High 8.0
Admin RCE via prepackaged plugins by way of misconfigured imports directory
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to validate import directory path configuration which allows admin users to execute arbitrary code via malicious plugin upload to prepackaged …
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High 7.6
One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an…
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Medium 6.5
Mattermost Server exposes sensitive user credentials during shared channel membership synchronization
Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerab…
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Medium 4.3
Weak cache keys lead to post IDOR and link preview poisoning
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via h…
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Low 3.1
IDOR in board file download allows any user to download any file by UUID
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration
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Low 3.1
Open redirect in OAuth login
Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs
Revision history
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#3
CVEs ergänzt, Beschreibung und Bewertung angepasst
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#2
CVE's ergänzt, Beschreibung aktualisiert
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#1
Initiale Fassung
References
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Mattermost Security Updates vom 2025-08-17
https://mattermost.com/security-updates/#server