CVE-2026-40263
Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-208 |
| Vendor | enchant97 |
| Product | note-mark |
| Published | Apr 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
enchant97 / note-mark
< 0.19.2