CVE-2022-31152

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and including version 1.61.0, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`) as a workaround.

• CWE-703
• CWE-755

• https://github.com/matrix-org/synapse/pull/13087Issue Tracking, Patch, Third Party Advisory
• https://github.com/matrix-org/synapse/pull/13088Issue Tracking, Patch, Third Party Advisory
• https://github.com/matrix-org/synapse/releases/tag/v1.62.0Release Notes, Third Party Advisory
• https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765Issue Tracking, Mitigation, Third Party Advisory
• https://github.com/matrix-org/synapse/pull/13087Issue Tracking, Patch, Third Party Advisory
• https://github.com/matrix-org/synapse/pull/13088Issue Tracking, Patch, Third Party Advisory
• https://github.com/matrix-org/synapse/releases/tag/v1.62.0Release Notes, Third Party Advisory
• https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765Issue Tracking, Mitigation, Third Party Advisory

Published

Sep 2, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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