CVE-2025-53890 CRITICAL

CVE-2025-53890: pyLoad vulnerable to remote code execution through js2py onCaptchaResult

Vendor Pyload
Product pyload
Weakness CWE-94 · Code injection
Published July 14, 2025
Last update July 15, 2025

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 14, 2025 CVE published
July 15, 2025 Record updated