Is CVE-2026-54219 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-54219 being exploited in the wild.

How severe is CVE-2026-54219?

Informational severity, with a CVSS score of 5.1, published 18 June 2026.

Which products and versions are affected?

UBB Systems UBB.threads All versions through 7.7.5.

Is there a fix for CVE-2026-54219?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-54219 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-54219?

Check whether you run UBB Systems UBB.threads at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-54219: UBB Systems UBB.threads Stored XSS in posts and profile fields

CVE-2026-54219 · Severity: info · CVSS 5.1 · Published 2026-06-18

UBB.threads, a forum and community software platform, is vulnerable to a security flaw where malicious code can be saved within user posts or profile fields. An attacker with a standard user account can upload harmful scripts that will automatically run in the browsers of other users, including administrators, when they view the affected content. This could lead to unauthorized actions being performed on behalf of users or the theft of sensitive session information.

Technologies: UBB Systems UBB.threads. Vendors: UBB Systems.

Quick answers

Is CVE-2026-54219 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-54219 being exploited in the wild.
How severe is CVE-2026-54219?: Informational severity, with a CVSS score of 5.1, published 18 June 2026.
Which products and versions are affected?: UBB Systems UBB.threads All versions through 7.7.5.
Is there a fix for CVE-2026-54219?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-54219 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-54219?: Check whether you run UBB Systems UBB.threads at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Stored Cross-Site Scripting (XSS) vulnerability exists in UBB.threads due to improper neutralization of user-supplied input in forum posts and user profile fields (CWE-79). An attacker with low-level privileges can inject malicious JavaScript into these fields, which is then stored on the server and executed in the security context of any user who views the compromised content. This vulnerability has been confirmed in version 7.7.5. Because the vendor did not respond to disclosure attempts, no official patch is currently available. The attack requires network access and a valid user account, but relies on a victim viewing the malicious content (User Interaction).

Affected products

UBB Systems UBB.threads All versions through 7.7.5

Timeline

2026-06-18: disclosed: Coordinated disclosure by CERT Polska
2026-06-18: advisory

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.