How severe is CVE-2026-4545?

CVE-2026-4545 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-4545 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4545?

CVE-2026-4545 affects Flos-freeware Notepad2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4545?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-4545 have an EU (EUVD) identifier?

Yes. CVE-2026-4545 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14299.

When was CVE-2026-4545 published?

CVE-2026-4545 was published on 2026-03-22 and last updated on 2026-06-17.

CVE-2026-4545

CVE-2026-4545 is a high-severity vulnerability in Flos-freeware Notepad2 with a CVSS 3.x base score of 7.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-426.

Key facts

Severity: High (CVSS 3.x base score 7.0)
CVSS v2: 6.0
CVSS v4: 7.3
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14299
Weakness: CWE-426
Affected product: Flos-freeware Notepad2
Published: 2026-03-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-4545?: 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.
How severe is CVE-2026-4545?: CVE-2026-4545 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-4545 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4545?: CVE-2026-4545 affects Flos-freeware Notepad2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4545?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-4545 have an EU (EUVD) identifier?: Yes. CVE-2026-4545 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14299.
When was CVE-2026-4545 published?: CVE-2026-4545 was published on 2026-03-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:flos-freeware:notepad2:4.2.25:*:*:*:*:*:*:*

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