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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54224 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54224

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-54224 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54224

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.