Username Enumeration Vulnerability in Note Mark Application by Enchant97
CVE-2026-40263

3.7LOW

Key Information:

Vendor

Enchant97

Status
Note-mark
Vendor
CVE Published:
16 April 2026

What is CVE-2026-40263?

The Note Mark application, a popular open-source note-taking tool, contains a vulnerability where the login endpoint verifies bcrypt passwords based only on the existence of a supplied username. This behavior allows attackers to determine valid usernames by measuring the response time of the verification process. By exploiting this timing variation, unauthorized users can perform targeted credential attacks, leading to potential compromise of user accounts. A patch has been released in version 0.19.2 to mitigate this risk.

Affected Version(s)

note-mark < 0.19.2

References

https://github.com/enchant97/note-mark/security/advisorie...
x_refsource_CONFIRM
https://github.com/enchant97/note-mark/commit/cf4c6f6acf7...
x_refsource_MISC

CVSS V3.1

Score:
3.7
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.