CVE-2026-40263
Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel
Vexday Risk Score
8Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 3.7EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
16 Apr 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
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