CVE-2018-12423: Incorrect Default Permissions

June 14, 2018 (updated October 3, 2019)

Unauthorised users can hijack rooms when there is no m.room.power_levels event in force.

References

matrix.org/blog/2018/06/14/security-update-synapse-0-31-2/
nvd.nist.gov/vuln/detail/CVE-2018-12423

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