What’s Vulnerable › Vulnerabilities

CVE-2026-108580: AniWorld Downloader before 5.3.0 WebUI Login Brute Force via /login

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-10 · updated 2026-10-16
• Weakness: CWE-307

Description

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.

Affected products

• phoenixthrush AniWorld Downloader: before 5.3.0 — fixed in 5.3.0

How to fix

Upgrade to a fixed version: phoenixthrush AniWorld Downloader 5.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/phoenixthrush/AniWorld-Downloader/blob/bb13599d17937fdb4df2df699024bc233f0656f2/src/aniworld/web/auth.py#L239-L256
• https://github.com/phoenixthrush/AniWorld-Downloader/commit/3c070bd10665377308a3092e11933681c18a5fd1
• https://github.com/phoenixthrush/AniWorld-Downloader/issues/334
• https://github.com/phoenixthrush/AniWorld-Downloader/releases/tag/v.5.3.0
• https://hackmd.io/@haind/aniworld-login-brute-force
• https://www.vulncheck.com/advisories/aniworld-downloader-before-5.3.0-webui-login-brute-force-via-login

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