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CVE-2026-4545— Flos Freeware Notepad2 PROPSYS.dll uncontrolled search path

Quick assessment

Affected
Flos Freeware Notepad2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Notepad2是Florian Balmer个人开发者的一个文本编辑器。 Notepad2 4.2.25版本存在代码问题漏洞，该漏洞源于库PROPSYS.dll存在未知功能，可能导致不受控制的搜索路径。

CVSS 7.0 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-4545

Vulnerability Information
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Vulnerability Title
Flos Freeware Notepad2 PROPSYS.dll uncontrolled search path
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对搜索路径元素未加控制
Source: CVE Program / CVE List V5
Vulnerability Title
Notepad2 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Notepad2是Florian Balmer个人开发者的一个文本编辑器。 Notepad2 4.2.25版本存在代码问题漏洞，该漏洞源于库PROPSYS.dll存在未知功能，可能导致不受控制的搜索路径。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Flos Freeware Notepad2 4.2.25 -

II. Public POCs for CVE-2026-4545

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III. Intelligence Information for CVE-2026-4545

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Vendor Advisories for CVE-2026-4545 (2)

Other References for CVE-2026-4545 (1)

IV. Related Vulnerabilities

Same product: Notepad2
Same vendor: Flos Freeware
Same weakness: CWE-427

V. Comments for CVE-2026-4545

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