# CVE-2026-54223: UBB Systems UBB.threads Path Traversal in Template Editor

Source: https://junglewise.ai/threats/cve-2026-54223-ubb-systems-ubb-threads-path-traversal-in-template-editor  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-18. Updated: 2026-06-20  
License: CC BY 4.0 with a link back

CVE-2026-54223 · Severity: info · CVSS 8.6 · Published 2026-06-18

UBB.threads, a forum and community software platform, contains a security flaw that allows high-privileged users to access or modify any file on the underlying server. By exploiting this path traversal vulnerability, an administrator or user with template-editing permissions could take full control of the server and execute malicious code. This could lead to a total compromise of the application, including the theft of user data or a complete service shutdown.

Technologies: [UBB Systems UBB.threads](https://junglewise.ai/threats/technologies/ubb-threads). Vendors: [UBB Systems](https://junglewise.ai/threats/vendors/ubb-systems).

## Quick answers

**Is CVE-2026-54223 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54223 being exploited in the wild.

**How severe is CVE-2026-54223?** Informational severity, with a CVSS score of 8.6, 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-2026-54223?** 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-2026-54223 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-54223?** 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 path traversal vulnerability (CWE-22) exists in UBB.threads through version 7.7.5. The flaw is located in the template editing functionality, where insufficient input validation allows an authenticated user with high privileges (specifically the ability to edit templates) to escape the intended directory. An attacker can leverage this to read or write arbitrary files that the web server process has permissions to access. This capability can be further escalated to achieve Remote Code Execution (RCE) on the host server. As the vendor has not responded to disclosure attempts, no official patch is currently available.

## Affected products

- UBB Systems UBB.threads All versions through 7.7.5

## Timeline

- 2026-06-18: disclosed: Vulnerability disclosed by CERT Polska
- 2026-06-18: advisory: CVE-2026-54223 published

## References

- [https://cert.pl/en/posts/2026/06/CVE-2026-54219](https://cert.pl/en/posts/2026/06/CVE-2026-54219)
- [https://www.ubbcentral.com/](https://www.ubbcentral.com/)

## Related threats

- [UBB Systems UBB.threads Denial of Service via resource exhaustion](https://junglewise.ai/threats/cve-2026-54224-ubb-systems-ubb-threads-denial-of-service-via-resource-exhaustion)
- [UBB Systems UBB.threads Blind SQL Injection in Members Control Panel](https://junglewise.ai/threats/cve-2026-54222-ubb-systems-ubb-threads-blind-sql-injection-in-members-control)
- [UBB Systems UBB.threads Reflected XSS](https://junglewise.ai/threats/cve-2026-54221-ubb-systems-ubb-threads-reflected-xss)
- [UBB Systems UBB.threads Cross-Site Request Forgery](https://junglewise.ai/threats/cve-2026-54220-ubb-systems-ubb-threads-cross-site-request-forgery)
- [UBB Systems UBB.threads Stored XSS in posts and profile fields](https://junglewise.ai/threats/cve-2026-54219-ubb-systems-ubb-threads-stored-xss-in-posts-and-profile-fields)