CVE-2025-53890

pyLoad vulnerable to remote code execution through js2py onCaptchaResult

Published Jul 14, 2025 CVSS 3.1 · 9.8 Critical EPSS 1.3% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-21406 pyLoad vulnerable to XSS through insecure CAPTCHA
Github GHSA Github GHSA GHSA-8w3f-4r8f-pf53 pyLoad vulnerable to XSS through insecure CAPTCHA
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics epss

{'score': 0.00256}

Type Values Removed Values Added
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.
Title pyLoad vulnerable to remote code execution through js2py onCaptchaResult
Weaknesses CWE-94
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 15, 2025, 7:48 PM
Reserved
Jul 11, 2025, 7:05 PM
Status
Deferred
Published
Jul 15, 2025, 12:15 AM
Modified
Jun 17, 2026, 9:39 AM