# CVE-2026-40263

> Vulnerability · severity: **LOW** (CVSS 3.7).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40263
- **Published:** 2026-04-17
- **CVSS severity:** LOW
- **CVSS base score:** 3.7
- **CWE codes:** CWE-208

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40263

## Citation

> AI Analytics. CVE-2026-40263. Retrieved 2026-07-10 from https://api.ai-analytics.org/cve/CVE-2026-40263. Derived from NIST NVD. Licensed CC0.

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