CVE-2026-33511— pyload-ng: Authentication Bypass via Host Header Injection in ClickNLoad
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I. Basic Information for CVE-2026-33511
Vulnerability Information
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Vulnerability Title
pyload-ng: Authentication Bypass via Host Header Injection in ClickNLoad
Source: NVD (National Vulnerability Database)
Vulnerability Description
pyLoad is a free and open-source download manager written in Python. From version 0.4.20 to before version 0.5.0b3.dev97, the local_check decorator in pyLoad's ClickNLoad feature can be bypassed by any remote attacker through HTTP Host header spoofing. This allows unauthenticated remote users to access localhost-restricted endpoints, enabling them to inject arbitrary downloads, write files to the storage directory, and execute JavaScript code. This issue has been patched in version 0.5.0b3.dev97.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
pyLoad 安全漏洞
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 0.4.20版本至0.5.0b3.dev97之前版本存在安全漏洞，该漏洞源于ClickNLoad功能中的local_check装饰器可通过HTTP Host标头欺骗被绕过，可能导致未经身份验证的远程用户访问本地主机限制的端点。
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)
Affected Products
II. Public POCs for CVE-2026-33511
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Same Patch Batch · pyload · 2026-03-24 · 3 CVEs total
| CVE-2026-33509 | 7.5 HIGH | pyload-ng: SETTINGS Permission Users Can Achieve Remote Code Execution via Unrestricted Re |
| CVE-2026-33314 | 6.5 MEDIUM | pyload-ng: Improper Authentication and Origin Validation Error |
IV. Related Vulnerabilities
Same product: pyload
- CVE-2026-41133
pyLoad has Stale Session Privilege After Role/Permission Cha - CVE-2026-40594
pyLoad: Session Cookie Security Downgrade via Untrusted X-Fo - CVE-2026-40071
pyLoad WebUI JSON permission mismatch lets ADD/DELETE users - CVE-2026-35592
pyLoad has an Incomplete Tar Path Traversal Fix in UnTar._sa - CVE-2026-35586
Authorization Bypass for SSL Certificate/Key Configuration D
Same vendor: pyload
- CVE-2026-41133
pyLoad has Stale Session Privilege After Role/Permission Cha - CVE-2026-40594
pyLoad: Session Cookie Security Downgrade via Untrusted X-Fo - CVE-2026-40071
pyLoad WebUI JSON permission mismatch lets ADD/DELETE users - CVE-2026-35592
pyLoad has an Incomplete Tar Path Traversal Fix in UnTar._sa - CVE-2026-35586
Authorization Bypass for SSL Certificate/Key Configuration D
Same weakness: CWE-639
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V. Comments for CVE-2026-33511
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