HOMEVULNERABILITIESCVE-2022-31152
HIGH

CVE-2022-31152

CWE-703Published: September 2, 2022· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2022-31152 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

matrix1 product(s)
synapse
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/matrix-org/synapse/pull/13087
PATCHhttps://github.com/matrix-org/synapse/pull/13088
PATCHhttps://github.com/matrix-org/synapse/pull/13087
PATCHhttps://github.com/matrix-org/synapse/pull/13088
ADVISORYhttps://github.com/matrix-org/synapse/releases/tag/v1.62.0
ADVISORYhttps://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765
ADVISORYhttps://github.com/matrix-org/synapse/releases/tag/v1.62.0
ADVISORYhttps://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765

All References (8)

→
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

Quick Facts

CVE IDCVE-2022-31152
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-703
CISA KEVNo
Affected1 vendor(s)
PublishedSep 2, 2022

Related CVEs (CWE-703)

CVE-2025-13023
9.8
CVE-2025-13026
9.8
CVE-2025-13021
9.8
CVE-2025-13022
9.8
CVE-2024-37995
9.1
CVE-2023-45927
9.1

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2022-31152 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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