CVE-2024-39274

HIGH

Mattermost 9.5.0-9.5.6 9.7.0-9.7.5 9.8.0-9.8.1 9.9.0 - Improper Access Control in Shared Channel Validation

Title source: llm
STIX 2.1

Description

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 properly validate that the channel that comes from the sync message is a shared channel, when shared channels are enabled, which allows a malicious remote to add users to arbitrary teams and channels

References (1)

Core 1
Core References

Scores

CVSS v3 8.7
EPSS 0.0020
EPSS Percentile 42.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-284
Status published
Products (3)
mattermost/mattermost 9.9.0
mattermost/mattermost 9.5.0 - 9.5.7
mattermost/mattermost 9.5.0 - 9.5.7Go
Published Aug 01, 2024
Tracked Since Feb 18, 2026