Vulnerability · Published Jun 18, 2026 · Assigned by CERT-PL

CVE-2026-54224Denial of Service in UBB.threads

High 7.1

In plain English

A high-severity security flaw in UBB.threads from UBB Systems. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.3%top 80.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

UBB.threads is vulnerable to Denial of Service (DoS). By sending multiple concurrent requests to view any user profile on instances with many registered users, an authenticated attacker can easily exhaust database resources and completely deny access to the application for other users. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.

Affected products (as reported)

Vendor	Product	Versions
UBB Systems	UBB.threads	0 – through 7.7.5

Weakness: CWE-405 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://www.ubbcentral.com/ product
https://cert.pl/en/posts/2026/06/CVE-2026-54219 third-party-advisory