PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-54223 UBB Systems CVE debrief

CVE-2026-54223 is a high-severity path traversal vulnerability in UBB.threads, allowing attackers with template editing privileges to read and write any file on the server, potentially leading to remote code execution. The vulnerability has been confirmed in version 7.7.5, but may affect other versions. Due to unsuccessful vendor contact attempts, the vulnerability's full scope remains uncertain. Organizations using UBB.threads should exercise caution and consider immediate action to mitigate potential risks.

Vendor
UBB Systems
Product
UBB.threads
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-18
Original CVE updated
2026-06-18
Advisory published
2026-06-18
Advisory updated
2026-06-18

Who should care

Administrators and security teams responsible for UBB.threads installations, particularly those with template editing privileges, should be aware of this vulnerability. Given the high CVSS score of 8.6, priority should be given to assessing and mitigating this vulnerability to prevent potential remote code execution.

Technical summary

The CVE-2026-54223 vulnerability is caused by a path traversal weakness in UBB.threads, specifically affecting version 7.7.5. Attackers with the ability to edit templates can exploit this vulnerability to access and modify any file on the server that the application has privileges to. This could lead to remote code execution, making it a critical security concern. The CVSS vector for this vulnerability is CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

Defensive priority

High

Recommended defensive actions

  • Immediately assess UBB.threads installations for vulnerability to CVE-2026-54223.
  • Restrict template editing privileges to only necessary personnel.
  • Regularly review and update UBB.threads to the latest version.
  • Implement additional security measures such as file access controls and monitoring.
  • Consider alternative solutions if UBB.threads cannot be secured.
  • Engage with the vendor or a third-party expert for further guidance.
  • Monitor for any signs of exploitation or anomalous activity.

Evidence notes

The information provided is based on data from the National Vulnerability Database (NVD) and other sources. The vulnerability has been confirmed in UBB.threads version 7.7.5, but may affect other versions. Due to unsuccessful vendor contact attempts, further details are limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54223 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54223

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-54223 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54223

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.