CVE-2026-108580 PUBLISHED

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.

• SiroxCW finder
• HaiND from the Post and Telecommunication Institute of Technology finder

• https://github.com/phoenixthrush/AniWorld-Downloader/issues/334
• https://github.com/phoenixthrush/AniWorld-Downloader/commit/3c070bd10665377308a3092e11933681c18a5fd1
• AniWorld Downloader v.5.3.0 Release Notes
• https://hackmd.io/@haind/aniworld-login-brute-force
• https://github.com/phoenixthrush/AniWorld-Downloader/blob/bb13599d17937fdb4df2df699024bc233f0656f2/src/aniworld/web/auth.py#L239-L256
• VulnCheck Advisory: AniWorld Downloader before 5.3.0 WebUI Login Brute Force via /login

• Improper Restriction of Excessive Authentication Attempts CWE