HOMEVULNERABILITIESCVE-2022-39335
MEDIUM

CVE-2022-39335

CWE-200Published: May 26, 2023· Updated: Jun 17, 2026

5.0
CVSS v3.1

Official Description

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.

NVD Source

Technical Analysis

CVE-2022-39335 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

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
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Official Patches & Advisories

PATCHhttps://github.com/matrix-org/synapse/pull/13823
PATCHhttps://github.com/matrix-org/synapse/pull/13823
ADVISORYhttps://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv
ADVISORYhttps://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv

All References (8)

→
https://github.com/matrix-org/synapse/issues/13288Issue Tracking
→
https://github.com/matrix-org/synapse/pull/13823Patch
→
https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwvMitigation · Vendor Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/
→
https://github.com/matrix-org/synapse/issues/13288Issue Tracking
→
https://github.com/matrix-org/synapse/pull/13823Patch
→
https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwvMitigation · Vendor Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/

Quick Facts

CVE IDCVE-2022-39335
CVSS Score5.0 / 10
SeverityMEDIUM
WeaknessCWE-200
CISA KEVNo
Affected1 vendor(s)
PublishedMay 26, 2023

Related CVEs (CWE-200)

CVE-2008-1252
10.0
CVE-2008-0082
10.0
CVE-2022-29165
10.0
CVE-2011-3497
10.0
CVE-2026-40965
10.0
CVE-2013-0693
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2022-39335 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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