6.8 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
33.5%
Mattermost 6.0 and earlier fails to sufficiently validate the email address during registration, which allows attackers to trick users into signing up using attacker-controlled email addresses via crafted invitation token.
hackerone.com/reports/1357013
mattermost.com/security-updates/