CVE-2024-39836: Mattermost allows remote/synthetic users to create sessions, reset passwords

August 22, 2024 (updated August 23, 2024)

Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 and 9.8.x <= 9.8.2 fail to ensure that remote/synthetic users cannot create sessions or reset passwords, which allows the munged email addresses, created by shared channels, to be used to receive email notifications and to reset passwords, when they are valid, functional emails.

References

github.com/advisories/GHSA-c6vp-jjgv-38wj
github.com/mattermost/mattermost
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2024-39836

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