Summaryinfo

A vulnerability marked as critical has been reported in pyLoad up to 0.4.20/0.5.0b3.dev97. This vulnerability affects the function local_check of the component ClickNLoad Feature. Performing a manipulation results in authorization. This vulnerability is cataloged as CVE-2026-33511. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in pyLoad up to 0.4.20/0.5.0b3.dev97. This affects the function local_check of the component ClickNLoad Feature. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-33511 since 03/20/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.5.0b3.dev97 eliminates this vulnerability.

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Productinfo

Name

• pyLoad

Version

• 0.4.0
• 0.4.1
• 0.4.2
• 0.4.3
• 0.4.4
• 0.4.5
• 0.4.6
• 0.4.7
• 0.4.8
• 0.4.9
• 0.4.10
• 0.4.11
• 0.4.12
• 0.4.13
• 0.4.14
• 0.4.15
• 0.4.16
• 0.4.17
• 0.4.18
• 0.4.19
• 0.4.20
• 0.5.0b3.dev97

Website

• Product: https://github.com/pyload/pyload/

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