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CVSS: 6.5EPSS: 0%CPEs: 2EXPL: 0

When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients. • https://mattermost.com/security-updates • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE-668: Exposure of Resource to Wrong Sphere •

CVSS: 5.4EPSS: 0%CPEs: 2EXPL: 0

When processing an email invite to a private channel on a team, Mattermost fails to validate the inviter's permission to that channel, allowing an attacker to invite themselves to a private channel. • https://mattermost.com/security-updates • CWE-862: Missing Authorization •

CVSS: 6.5EPSS: 0%CPEs: 1EXPL: 1

Mattermost version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service. Mattermost versión 7.1.x y anteriores, no procesan suficientemente un archivo GIF específicamente diseñado cuando es descargado mientras es redactada una publicación, lo que permite a usuarios autenticados causar el agotamiento de los recursos mientras es procesado el archivo, resultando en una Denegación de Servicio del lado del servidor. • https://hackerone.com/reports/1620170 https://mattermost.com/security-updates • CWE-400: Uncontrolled Resource Consumption CWE-434: Unrestricted Upload of File with Dangerous Type •

CVSS: 6.5EPSS: 0%CPEs: 1EXPL: 0

Mattermost version 7.0.x and earlier fails to sufficiently limit the in-memory sizes of concurrently uploaded JPEG images, which allows authenticated users to cause resource exhaustion on specific system configurations, resulting in server-side Denial of Service. Mattermost versiones 7.0.x y anteriores, no limitan suficientemente los tamaños en memoria de las imágenes JPEG cargadas simultáneamente, lo que permite a usuarios autenticados causar el agotamiento de los recursos en configuraciones específicas del sistema, resultando en una Denegación de Servicio del lado del servidor • https://hackerone.com/reports/1549513 https://mattermost.com/security-updates • CWE-400: Uncontrolled Resource Consumption CWE-770: Allocation of Resources Without Limits or Throttling •

CVSS: 6.5EPSS: 0%CPEs: 5EXPL: 0

Unrestricted information disclosure of all users in Mattermost version 6.7.0 and earlier allows team members to access some sensitive information by directly accessing the APIs. Una divulgación de información sin restricciones de todos los usuarios en Mattermost versiones 6.7.0 y anteriores, permite a miembros del equipo acceder a determinada información confidencial mediante el acceso directo a las API • https://mattermost.com/security-updates • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor •