CVE-2026-54223 Remote Code Execution via arbitrary file read and write in UBB.threads
Privileged attackers can exploit path traversal in UBB.threads to read/write arbitrary files, leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54223?
CVE-2026-54223 is a high-severity path traversal vulnerability in UBB.threads, published on 18 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-54223?
How do I fix CVE-2026-54223?
No fix has been published for CVE-2026-54223 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-54223 being exploited?
There is no known exploitation of CVE-2026-54223 in the wild and no public exploit code.
Sources
Also known as GHSA-jgf8-gg7j-fq24.