Stored XSS Vulnerability in UBB.threads by UBB Central
CVE-2026-54219

5.1MEDIUM

Key Information:

Vendor

Ubb Systems

Status
Ubb.threads
Vendor
CVE Published:
18 June 2026

What is CVE-2026-54219?

The UBB.threads application by UBB Central is susceptible to a Stored XSS vulnerability that arises from inadequate sanitization of user inputs. This flaw allows low-privileged attackers to embed arbitrary JavaScript code into user posts and profile fields. When other users view these posts or user profiles, the malicious script executes in their browsers, potentially leading to unauthorized actions or data theft. Although the vulnerability has been confirmed in version 7.7.5, it may impact other versions of the product as well.

Affected Version(s)

UBB.threads 0 <= 7.7.5

References

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

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kamil Szczurowski (Securitum)
Michał Wnękowicz (Securitum)
.