SB20231010105 - Input validation error in Synapse
Published: October 10, 2023 Updated: May 4, 2026
Security Bulletin ID
SB20231010105
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Input validation error (CVE-ID: CVE-2023-45129)
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in server ACL event handling when processing malicious server ACL events. A remote privileged user can send a malicious server ACL event to cause a denial of service.
Homeservers running on a closed federation are not affected.
Remediation
Install update from vendor's website.