# 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.

- **Severity:** High 7.3 (`CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Mar 2026
- **Updated:** 24 Mar 2026
- **Also known as:** GHSA-mjfx-9m7c-mcxv

## 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.

Weakness: CWE-427 (Uncontrolled Search Path Element), CWE-426 (Untrusted Search Path)

## Which versions are affected by CVE-2026-4545?

It affects 1 product.


Products: 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.

## 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

- [CVE-2026-4546](https://insights.sbomify.com/CVE-2026-4546/): Flos Freeware Notepad2 TextShaping.dll uncontrolled search path (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4545 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-4545 in the wild and no public exploit code.

Affected product: Flos Freeware Notepad2. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4545/ (Markdown: https://insights.sbomify.com/CVE-2026-4545/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4545
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4545
- OSV: https://osv.dev/vulnerability/CVE-2026-4545

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4545/
Summaries are generated and may contain mistakes; the official description above is the record.