CWE
284
Advisory Published
Advisory Published
Updated

CVE-2024-39777: Malicious remote can invite itself to an arbitrary local channel

First published: Thu Aug 01 2024(Updated: )

Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels are enabled, which allows a malicious remote to send an invite with the ID of an existing local channel, and that local channel will then become shared without the consent of the local admin.

Credit: responsibledisclosure@mattermost.com responsibledisclosure@mattermost.com

Affected SoftwareAffected VersionHow to fix
Mattermost Mattermost>=9.5.0<9.5.7
Mattermost Mattermost>=9.7.0<9.7.6
Mattermost Mattermost>=9.8.0<9.8.2
Mattermost Mattermost=9.9.0
go/github.com/mattermost/mattermost/server/v8>=9.8.0<9.8.1
9.8.1
go/github.com/mattermost/mattermost/server/v8>=9.7.0<9.7.6
9.7.6
go/github.com/mattermost/mattermost/server/v8>=9.5.0<9.5.7
9.5.7
go/github.com/mattermost/mattermost/server/v8>=9.9.0<9.9.1
9.9.1
>=9.5.0<9.5.7
>=9.7.0<9.7.6
>=9.8.0<9.8.2
=9.9.0

Remedy

Update Mattermost to versions 9.10.0, 9.9.1, 9.5.7, 9.7.6, 9.8.2 or higher.

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