---
id: CVE-2026-108580
title: >-
  AniWorld Downloader before 5.3.0 contains an improper restriction of
  authentication attempts vulnerability in the WebUI /login POST handler that
  allows unauthenticated attackers to guess passwords without throttling
summary: >-
  AniWorld Downloader before 5.3.0 contains an improper restriction of
  authentication attempts vulnerability in the WebUI /login POST handler that
  allows unauthenticated attackers to guess passwords without throttling.
  Attackers can enumer…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-307
published: '2026-10-10'
updated: '2026-10-10'
sourceUpdated: '2026-10-10T16:16:31.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108580'
references:
  - url: >-
      https://github.com/phoenixthrush/AniWorld-Downloader/blob/bb13599d17937fdb4df2df699024bc233f0656f2/src/aniworld/web/auth.py#L239-L256
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/phoenixthrush/AniWorld-Downloader/commit/3c070bd10665377308a3092e11933681c18a5fd1
    label: disclosure@vulncheck.com
  - url: 'https://github.com/phoenixthrush/AniWorld-Downloader/issues/334'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/phoenixthrush/AniWorld-Downloader/releases/tag/v.5.3.0'
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@haind/aniworld-login-brute-force'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/aniworld-downloader-before-5.3.0-webui-login-brute-force-via-login
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-10T16:27:15.748Z'
---

## Overview

AniWorld Downloader before 5.3.0 contains an improper restriction of authentication attempts vulnerability in the WebUI /login POST handler that allows unauthenticated attackers to guess passwords without throttling. Attackers can enumerate usernames through verify_user response timing and brute-force passwords on exposed WebUI instances to take over accounts.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.