CVE-2026-4545 Flos Freeware Notepad2 PROPSYS.dll uncontrolled search path
Local attackers can exploit an uncontrolled search path in PROPSYS.dll to potentially execute arbitrary code in Notepad2.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4545?
CVE-2026-4545 is a high-severity path traversal vulnerability in Flos Freeware Notepad2, published on 22 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A security flaw has been discovered in Flos Freeware Notepad2 4.2.25. This affects an unknown function in the library PROPSYS.dll. Performing a manipulation results in uncontrolled search path. The attack is only possible with local access. The attack is considered to have high complexity. The exploitability is reported as difficult. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-4545?
It affects 1 product.
Products include Flos-Freeware Notepad2.
How do I fix CVE-2026-4545?
No fix has been published for CVE-2026-4545 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-2026-4545 being exploited?
There is no known exploitation of CVE-2026-4545 in the wild and no public exploit code.
Other vulnerabilities in Flos Freeware Notepad2
Sources
Also known as GHSA-mjfx-9m7c-mcxv.