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CVE-2026-40263

3.7 · LOW

Note Mark is an open-source note-taking application.

Published Apr 17, 2026CWE-208EPSS 0.31%

Overview

CVE-2026-40263 is a low-severity vulnerability. It was published on April 17, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the login endpoint performs bcrypt password verification only when the supplied username exists, returning immediately for nonexistent usernames. This timing discrepancy allows unauthenticated attackers to enumerate valid usernames by measuring response times, enabling targeted credential attacks. This issue has been fixed in version 0.19.2.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/enchant97/note-mark/commit/cf4c6f6acf70b569d80396d323b067c00d45c034GitHubgithub.com/enchant97/note-mark/security/advisories/GHSA-w6m9-39cv-2fwpGitHubgithub.com/enchant97/note-mark/security/advisories/GHSA-w6m9-39cv-2fwp

How CyberStrike helps

Frequently asked questions

What is CVE-2026-40263?

CVE-2026-40263 is a low-severity vulnerability. It was published on April 17, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-40263?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-40263?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-40263?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-40263 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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