Information disclosure in Matrix Synapse
CVE-2023-43796
Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System adminis…
Vulnerability class: Information Disclosure
EPSS: 0.009 (55.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Matrix Synapse
- Matrix-org Synapse — versions < 1.95.1
- Fedoraproject Fedora — versions 38, 39
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Mailing List)
- security-advisories@github.com (Mailing List)
- security-advisories@github.com
Frequently asked questions
- What is CVE-2023-43796?
- CVE-2023-43796 is a medium-severity vulnerability in Matrix Synapse, classified under Information Disclosure. CVSS score: 5.3/10. Published 2023-10-31.
- How severe is CVE-2023-43796?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2023-43796 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.