HumanSignal label-studio up to 1.15.x URL /projects/upload-example label_config cross site scripting

Summaryinfo

A vulnerability was found in HumanSignal label-studio up to 1.15.x. It has been classified as problematic. Affected by this issue is some unknown functionality of the file /projects/upload-example of the component URL Handler. Performing a manipulation of the argument label_config results in cross site scripting. This vulnerability was named CVE-2025-25296. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in HumanSignal label-studio up to 1.15.x. This affects an unknown code block of the file /projects/upload-example of the component URL Handler. The manipulation of the argument label_config with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. The summary by CVE is:

Label Studio is an open source data labeling tool. Prior to version 1.16.0, Label Studio's `/projects/upload-example` endpoint allows injection of arbitrary HTML through a `GET` request with an appropriately crafted `label_config` query parameter. By crafting a specially formatted XML label config with inline task data containing malicious HTML/JavaScript, an attacker can achieve Cross-Site Scripting (XSS). While the application has a Content Security Policy (CSP), it is only set in report-only mode, making it ineffective at preventing script execution. The vulnerability exists because the upload-example endpoint renders user-provided HTML content without proper sanitization on a GET request. This allows attackers to inject and execute arbitrary JavaScript in victims' browsers by getting them to visit a maliciously crafted URL. This is considered vulnerable because it enables attackers to execute JavaScript in victims' contexts, potentially allowing theft of sensitive data, session hijacking, or other malicious actions. Version 1.16.0 contains a patch for the issue.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2025-25296 since 02/06/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 1.16.0 eliminates this vulnerability. Applying the patch 8cf6958e1e27ef6a03ed287e674470975d340885 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• HumanSignal

Name

• label-studio

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15

License

• open-source

Website

• Product: https://github.com/HumanSignal/label-studio/

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CPE 2.2info

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