pyLoad up to 0.5.0b3.dev98 Content Security Policy packages.js cross site scripting

Summaryinfo

A vulnerability labeled as problematic has been found in pyLoad. The impacted element is an unknown function of the file packages.js of the component Content Security Policy Handler. Such manipulation leads to cross site scripting. This vulnerability is traded as CVE-2026-45348. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in pyLoad. Affected by this issue is an unknown part of the file packages.js of the component Content Security Policy Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev100, the packages.js template at src/pyload/webui/app/themes/modern/templates/js/packages.js:172 interpolates a stored link URL into a template literal inside single-quoted HTML and then writes the result to the DOM via $(div).html(html). No escaping runs between the API value and innerHTML. An attacker (Alice) who can submit a package link puts a single quote plus event handler into the URL, breaks out of the attribute, and executes JavaScript in every operator's browser that opens the downloads view. The theme does not set a Content Security Policy that restricts inline script or event handlers. This vulnerability is fixed in 0.5.0b3.dev100.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-45348 since 05/11/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 0.5.0b3.dev100 eliminates this vulnerability.

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Productinfo

Name

• pyLoad

Version

• 0.5.0b3.dev31
• 0.5.0b3.dev32
• 0.5.0b3.dev33
• 0.5.0b3.dev36
• 0.5.0b3.dev40
• 0.5.0b3.dev41
• 0.5.0b3.dev42
• 0.5.0b3.dev44
• 0.5.0b3.dev75
• 0.5.0b3.dev77
• 0.5.0b3.dev78
• 0.5.0b3.dev79
• 0.5.0b3.dev87
• 0.5.0b3.dev88
• 0.5.0b3.dev89
• 0.5.0b3.dev90
• 0.5.0b3.dev91
• 0.5.0b3.dev92
• 0.5.0b3.dev97
• 0.5.0b3.dev98

Website

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

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