Malicious remote can create/update/delete arbitrary posts in arbitrary channels
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.5epss 0.4%
exploitation probability
0.4%top 70% of all CVEs
observed exploitation
nono source reports it
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to properly validate synced posts, when shared channels are enabled, which allows a malicious remote to create/update/delete arbitrary posts in arbitrary channels
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L
Affected products
Mattermost · MattermostReferences
https://mattermost.com/security-updates