UBB Systems UBB.threads up to 7.7.5 path traversal

Summaryinfo

A vulnerability was found in UBB Systems UBB.threads up to 7.7.5. It has been classified as critical. This affects an unknown part. The manipulation leads to path traversal. This vulnerability is traded as CVE-2026-54223. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in UBB Systems UBB.threads up to 7.7.5 and classified as critical. This issue affects an unknown code block. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

UBB.threads is vulnerable to Path traversal, allowing attackers with privilege to edit templates to read and write any file on the application’s server that application has privileges to, what results in Remote Code Execution.  Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.

The weakness was shared by Kamil Szczurowski. The identification of this vulnerability is CVE-2026-54223 since 06/12/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/18/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• UBB Systems

Name

• UBB.threads

Version

• 7.7.0
• 7.7.1
• 7.7.2
• 7.7.3
• 7.7.4
• 7.7.5

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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