{"cve":"CVE-2026-40263","nvd":{"published":"2026-04-17T01:17:40.137","modified":"2026-10-26T21:10:00.170","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7},"cwes":["CWE-208"],"references":["https://github.com/enchant97/note-mark/commit/cf4c6f6acf70b569d80396d323b067c00d45c034","https://github.com/enchant97/note-mark/security/advisories/GHSA-w6m9-39cv-2fwp","https://github.com/enchant97/note-mark/security/advisories/GHSA-w6m9-39cv-2fwp"],"products":[],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-40263","score":0.002,"percentile":0.09729,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-w6m9-39cv-2fwp","url":"https://osv.dev/vulnerability/GHSA-w6m9-39cv-2fwp","summary":"Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel","modified":"2026-06-25T23:11:42.943800917Z","packages":[{"ecosystem":"Go","name":"github.com/enchant97/note-mark/backend","purl":"pkg:golang/github.com/enchant97/note-mark/backend","ranges":["<0.19.2-0.20260411145025-cf4c6f6acf70"],"fixed":["0.19.2-0.20260411145025-cf4c6f6acf70"]}]},{"id":"GO-2026-5696","url":"https://osv.dev/vulnerability/GO-2026-5696","summary":"Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel in github.com/enchant97/note-mark/backend","modified":"2026-06-25T23:01:28.026622980Z","packages":[{"ecosystem":"Go","name":"github.com/enchant97/note-mark/backend","purl":"pkg:golang/github.com/enchant97/note-mark/backend","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}