Vulnerability in Matrix Synapse

CVE-2018-12423

In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force.

EPSS: 0.018 (76.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

References

Frequently asked questions

What is CVE-2018-12423?
CVE-2018-12423 is a high-severity vulnerability in Matrix Synapse. CVSS score: 7.5/10. Published 2018-06-14.
How severe is CVE-2018-12423?
High severity. CVSS v3 base score is 7.5 out of 10.