CVE-2026-40263 | THREATINT

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.

PUBLISHED Reserved 2026-04-10 | Published 2026-04-16 | Updated 2026-04-17 | Assigner GitHub_M

LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-208: Observable Timing Discrepancy

Product status

< 0.19.2

affected

References

github.com/...e-mark/security/advisories/GHSA-w6m9-39cv-2fwp exploit

github.com/...e-mark/security/advisories/GHSA-w6m9-39cv-2fwp

github.com/...ommit/cf4c6f6acf70b569d80396d323b067c00d45c034

cve.org (CVE-2026-40263)

nvd.nist.gov (CVE-2026-40263)

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