CVE-2021-47971: My-Notes-Safe My Notes Safe

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

My Notes Safe 5.3 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash.

Affected products

• My-Notes-Safe My Notes Safe: version 5.3 only

Published 2026-05-16. Last modified 2026-06-17.