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

Quick assessment

Affected
pyload pyload
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

pyLoad是pyLoad开源的一个用 Python 编写的免费开源下载管理器。 pyLoad存在代码注入漏洞，该漏洞源于不安全的JavaScript评估，可能导致远程代码执行。

CVSS 9.8 · Critical EPSS 1.16% · P66
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I. Basic Information for CVE-2025-53890

Vulnerability Information
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Vulnerability Title
pyLoad vulnerable to remote code execution through js2py onCaptchaResult
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
pyLoad 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pyLoad是pyLoad开源的一个用 Python 编写的免费开源下载管理器。 pyLoad存在代码注入漏洞，该漏洞源于不安全的JavaScript评估，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
pyload pyload < 0.5.0b3.dev89 -

II. Public POCs for CVE-2025-53890

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6505 chars
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III. Intelligence Information for CVE-2025-53890

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Vendor Advisories for CVE-2025-53890 (1)

IV. Related Vulnerabilities

Same product: pyload
Same vendor: pyload
Same weakness: CWE-94

V. Comments for CVE-2025-53890

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