CVE-2026-111855 Path traversal in 3 Series MDO
Remote attackers can read arbitrary files via path traversal in the web interface, potentially without authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-111855?
CVE-2026-111855 is a high-severity path traversal vulnerability in Tektronix 3 Series MDO, published on 17 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered on Tektronix 3 Series MDO devices before 1.21.1. A path traversal vulnerability exists in the web management interface of the device. Insufficient validation of user-supplied file paths allows remote attackers to read arbitrary files accessible to the application. Depending on configuration, exploitation may be possible without authentication.
Weakness: CWE-22
Which versions are affected by CVE-2026-111855?
How do I fix CVE-2026-111855?
No fix has been published for CVE-2026-111855 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-2026-111855 being exploited?
There is no known exploitation of CVE-2026-111855 in the wild and no public exploit code.
Sources
Also known as GHSA-grh2-338g-6c79.