CVE-2025-53890 - CVE House
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Status published Critical CVE-2025-53890

pyLoad vulnerable to remote code execution through js2py onCaptchaResult

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2025-55156
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CVE-2025-54802
pyLoad CNL Blueprint is vulnerable to Path Traversal through `dlc_path` leading to Remote Code Execution (RCE)
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CVE-2025-54140
pyLoad has Path Traversal Vulnerability in json/upload Endpoint that allows Arbitrary File Write
High 7.5

Affected Vendor

Affected Software

pyload
Vulnerable Versions:
< 0.5.0b3.dev89

Timeline

Official Publish: July 14th, 2025
Last Modified: July 15th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-94

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1505.003 Web Shell
Persistence
T1105 Ingress Tool Transfer
Command and Control
T1565.002 Stored Data Manipulation
Impact