PatchSiren cyber security CVE debrief
CVE-2026-54224 UBB Systems CVE debrief
CVE-2026-54224 is a high-severity Denial of Service (DoS) vulnerability affecting UBB.threads. An authenticated attacker can exploit this vulnerability by sending multiple concurrent requests to view any user profile on instances with many registered users, leading to database resource exhaustion and complete denial of access to the application for other users. The vulnerability has been confirmed in version 7.7.5, but may also affect other versions. Successful exploitation requires a low attack complexity and privileges. The CVSS score for this vulnerability is 7.1, indicating a high severity. Organizations using UBB.threads should take immediate action to mitigate this vulnerability.
- Vendor
- UBB Systems
- Product
- UBB.threads
- CVSS
- HIGH 7.1
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-18
- Original CVE updated
- 2026-06-18
- Advisory published
- 2026-06-18
- Advisory updated
- 2026-06-18
Who should care
Administrators and users of UBB.threads, especially those with instances having many registered users, should be aware of this vulnerability and take necessary precautions to prevent exploitation.
Technical summary
The vulnerability exists in UBB.threads, a popular discussion forum software. By sending multiple concurrent requests to view user profiles, an authenticated attacker can exhaust database resources, leading to a Denial of Service (DoS) condition. This vulnerability has been confirmed in version 7.7.5, but may also affect other versions. The attack complexity is low, and the attacker needs to have low privileges to exploit this vulnerability.
Defensive priority
High
Recommended defensive actions
- Update UBB.threads to the latest version, if available
- Implement rate limiting on requests to view user profiles
- Monitor database resource usage and adjust configuration as needed
- Restrict access to user profile pages to authorized users only
- Consider implementing a Web Application Firewall (WAF) to detect and prevent suspicious traffic
- Regularly review and update access controls to prevent exploitation
Evidence notes
The vulnerability has been confirmed in version 7.7.5 of UBB.threads, but may also affect other versions. The CVSS score for this vulnerability is 7.1, indicating a high severity. The attack complexity is low, and the attacker needs to have low privileges to exploit this vulnerability. [ref-4], [ref-5], and [nvd] provide additional context and details about this vulnerability.
Official resources
public