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In the case of authentication endpoints, this timing discrepancy is often caused by short-circuiting due to the lack of a matched user to compare against - as is the case with Sync-in.\n\n### Validation\nTickTock Enum (Burp Suite Extension) was utilized to validate this finding. Authentication attempts with a valid username see a response from the application at around 350-400ms on average, while invalid usernames are returned at only 95-100ms on average.\n<img width=\"1302\" height=\"284\" alt=\"image\" src=\"https://github.com/user-attachments/assets/31eeb72a-c3c2-4057-ac69-c0c92f0bbd4e\" />\n\n### Impact\nAn unauthenticated remote attacker can enumerate valid usernames. This significantly weakens the application's security posture by facilitating targeted brute-force attacks, stuffing, social engineering, and a suite of other more targeted attacks.","state":0,"publishedAt":"2026-04-15T18:57:50+00:00","modifiedAt":"2026-05-12T17:16:56.9455+00:00","affected":[{"ecosystem":"npm","name":"@sync-in/server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.2.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5","https://nvd.nist.gov/vuln/detail/CVE-2026-41161","https://github.com/Sync-in/server","https://github.com/Sync-in/server/releases/tag/v2.2.0"],"sourceUrl":"https://github.com/advisories/GHSA-43fj-qp3h-hrh5","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-43fj-qp3h-hrh5","identifiers":["GHSA-43fj-qp3h-hrh5","CVE-2026-41161"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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