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Critical · 9.8 CVE-2025-53890 EUVD-2025-21406GHSA-8w3f-4r8f-pf53PYSEC-2026-496

pyLoad vulnerable to remote code execution through js2py onCaptchaResult

Published Jul 14, 2025 · Updated Jul 15, 2025 · Assigned by GitHub_M

Description

pyload is an open-source Download Manager written in pure Python. An unsafe JavaScript evaluation vulnerability in pyLoad’s CAPTCHA processing code allows unauthenticated remote attackers to execute arbitrary code in the client browser and potentially the backend server. Exploitation requires no user interaction or authentication and can result in session hijacking, credential theft, and full system remote code execution. Commit 909e5c97885237530d1264cfceb5555870eb9546, the patch for the issue, is included in version 0.5.0b3.dev89.

Affected products

VendorProductAffectedFixed
pyload pyload < 0.5.0b3.dev89 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI pyload-ng < 0.20 0.20 GHSA-8w3f-4r8f-pf53

References