CVE-2022-39335: matrix-org synapse
Vulnerability summary
CVE-2022-39335 is a medium (CVSS 5.0) vulnerability in matrix-org synapse. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 26-05-2023PublishedVulnerability first disclosed.
- 13-02-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · PypiEcosystem advisory · calculated5.0MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
- OSV · UbuntuEcosystem advisory · calculated5.0MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
- OSV · DebianEcosystem advisory · calculated5.0MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
- NVDNIST5.0MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
EPSS trend
Probability
0.64%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
0.00 pp
From 0.64% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-200Exposure of Sensitive Information to an Unauthorized ActorThe product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
- CWE-862Missing AuthorizationThe product does not perform an authorization check when an actor attempts to access a resource or perform an action.
Affected systems
Debian1 product
- matrix-synapse< 1.69.0-1
Matrix1 product
- synapse< 1.69.0
Matrix-org1 product
- synapse< 1.69.0
PyPI1 product
- matrix-synapse< 1.69.0
Ubuntu1 product
- matrix-synapseAll versions (No fix recorded) | < 1.53.0-1ubuntu0.1~esm2
5 vendors · 5 products
References
12 links- github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwvX Refsource CONFIRMWEBAdvisoryREPORTMitigationVendor Advisory
