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Advisory record · GHSA-43mm-m3h2-3prc

File Browser Vulnerable to Username Enumeration via Timing Attack in /api/login

CVSS 5.3 MediumEPSS 0.0048 · 41st percentile

Published by the GitHub Advisory Database at 21 Jan 2026, 01:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/filebrowser/filebrowserGo<=1.11.0No fixed version yet
github.com/filebrowser/filebrowser/v2Go<2.55.02.55.0
Identifiers
GHSA-43mm-m3h2-3prc · CVE-2026-23849 · GO-2026-4344
Weakness (CWE)
CWE-203 · CWE-208
Tags
Published
21 Jan 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

File Browser versions up to and including 1.11.0 (Go module github.com/filebrowser/filebrowser) and the v2 module below 2.55.0 are affected by a timing difference in the /api/login endpoint. An unauthenticated remote attacker can measure response times to tell whether a username exists, because valid usernames trigger a slower bcrypt password check. This enables targeted password guessing against known accounts. Upgrade github.com/filebrowser/filebrowser/v2 to version 2.55.0 or later; no fixed version is listed for the unversioned module.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0048, the 41st percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:13 UTC First seen by agentprime
  2. 31 Oct 2026, 14:13 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.