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.
Published: 2025-07-14
Score: 9.8 Critical
EPSS: 1.1% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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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

Tue, 15 Jul 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Tue, 15 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00256}


Tue, 15 Jul 2025 00:15:00 +0000

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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-07-15T19:48:50.099Z

Reserved: 2025-07-11T19:05:23.824Z

Link: CVE-2025-53890

cve-icon Vulnrichment

Updated: 2025-07-15T13:24:24.821Z

cve-icon NVD

Status : Deferred

Published: 2025-07-15T00:15:24.150

Modified: 2026-04-15T00:35:42.020

Link: CVE-2025-53890

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-07-16T21:35:34Z

Weaknesses