CVE-2018-12291: Incorrect Default Permissions

June 13, 2018 (updated October 3, 2019)

The on_get_missing_events function in handlers/federation.py in Matrix Synapse has a security bug in the get_missing_events federation API where event visibility rules were not applied correctly.

References

nvd.nist.gov/vuln/detail/CVE-2018-12291

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