CVE-2026-40263
Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel in github.com/enchant97/note-mark/backend
Description
Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel in github.com/enchant97/note-mark/backend. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/enchant97/note-mark/backend before v0.19.2-0.20260411145025-cf4c6f6acf70.
How to fix CVE-2026-40263
To remediate CVE-2026-40263, upgrade the affected package to a fixed version below.
- —upgrade to 0.19.2-0.20260411145025-cf4c6f6acf70 or later
- —no fix listed
Is CVE-2026-40263 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 0.19.2-0.20260411145025-cf4c6f6acf70
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |