{"cve":"CVE-2026-23849","nvd":{"published":"2026-01-19T21:15:51.653","modified":"2026-06-17T10:22:12.120","status":"Analyzed","description":"File Browser provides a file managing interface within a specified directory and can be used to upload, delete, preview, rename, and edit files. Prior to version 2.55.0, the JSONAuth. Auth function contains a logic flaw that allows unauthenticated attackers to enumerate valid usernames by measuring the response time of the /api/login endpoint. The vulnerability exists due to a \"short-circuit\" evaluation in the authentication logic. When a username is not found in the database, the function returns immediately. However, if the username does exist, the code proceeds to verify the password using bcrypt (users.CheckPwd), which is a computationally expensive operation designed to be slow. This difference in execution path creates a measurable timing discrepancy. Version 2.55.0 contains a patch for the issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-203","CWE-208"],"references":["https://github.com/filebrowser/filebrowser/commit/24781badd413ee20333aba5cce1919d676e01889","https://github.com/filebrowser/filebrowser/security/advisories/GHSA-43mm-m3h2-3prc"],"products":["filebrowser:filebrowser"],"source":"nvd","synced_at":"2026-10-19T22:21:16.563232421+00:00"},"epss":{"cve":"CVE-2026-23849","score":0.00478,"percentile":0.41292,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-43mm-m3h2-3prc","url":"https://osv.dev/vulnerability/GHSA-43mm-m3h2-3prc","summary":"File Browser Vulnerable to Username Enumeration via Timing Attack in /api/login","modified":"2026-09-10T03:50:58.934925877Z","packages":[{"ecosystem":"Go","name":"github.com/filebrowser/filebrowser","purl":"pkg:golang/github.com/filebrowser/filebrowser","ranges":["<=1.11.0"],"fixed":[]},{"ecosystem":"Go","name":"github.com/filebrowser/filebrowser/v2","purl":"pkg:golang/github.com/filebrowser/filebrowser/v2","ranges":["<2.55.0"],"fixed":["2.55.0"]}]},{"id":"GO-2026-4344","url":"https://osv.dev/vulnerability/GO-2026-4344","summary":"File Browser Vulnerable to Username Enumeration via Timing Attack in /api/login in github.com/filebrowser/filebrowser","modified":"2026-02-04T13:58:53.162322Z","packages":[{"ecosystem":"Go","name":"github.com/filebrowser/filebrowser","purl":"pkg:golang/github.com/filebrowser/filebrowser","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/filebrowser/filebrowser/v2","purl":"pkg:golang/github.com/filebrowser/filebrowser/v2","ranges":["<2.55.0"],"fixed":["2.55.0"]}]}],"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."]}