SB20240109113 - Multiple vulnerabilities in Discourse
Published: January 9, 2024 Updated: July 1, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Resource exhaustion (CVE-ID: CVE-2023-48297)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in message serializer when processing expanded chat mentions. A remote attacker can send content containing @all or @here mentions to cause a denial of service.
The issue is triggered by the full list of mentioned users being included in the serialized message data, which can result in a very large user array.
2) Resource exhaustion (CVE-ID: CVE-2024-21655)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in client-editable custom field values when processing oversized field data. A remote user can submit excessively large custom field values to cause a denial of service.
The issue can lead to excessive disk space consumption and often excessive bandwidth usage.
Remediation
Install update from vendor's website.