CVE-2025-25296 – label-studio

Package

Manager: pip
Name: label-studio
Vulnerable Version: >=0 <1.16.0

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.02788 pctl0.85532

Details

Label Studio allows Cross-Site Scripting (XSS) via GET request to `/projects/upload-example` endpoint ## Description 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. ## Steps to reproduce 1. Create a malicious label config that includes an XSS payload in embedded task data: ```xml <View><HyperText name="text" value="$text"/></View> ``` 2. URL encode the payload and access the following URL: - http://app/projects/upload-example/?label_config=%3CView%3E%3C!--%20{%22data%22:%20{%22text%22:%20%22%3Cdiv%3E%3Cimg%20src=x%20onerror=eval(atob(`YWxlcnQoIlhTUyIp`))%3E%3C/div%3E%22}}%20--%3E%3CHyperText%20name=%22text%22%20value=%22$text%22/%3E%3C/View%3E When executed, the payload causes the application to render an HTML page containing an img tag that fails to load, triggering the onerror event handler which executes base64-decoded JavaScript, demonstrating successful XSS execution in the victim's browser. ## Mitigations - Enable the Content Security Policy in enforcement mode instead of report-only mode to actively block unauthorized script execution - Deprecate the `GET` behavior at the `example-config` endpoint since it's not used ## Impact The vulnerability requires no special privileges and can be exploited by getting a victim to visit a crafted URL. The impact is high as it allows arbitrary JavaScript execution in victims' browsers, potentially exposing sensitive data or enabling account takeover through session theft.

Metadata

Created: 2025-02-14T15:23:03Z
Modified: 2025-02-14T22:18:12Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/02/GHSA-wpq5-3366-mqw4/GHSA-wpq5-3366-mqw4.json
CWE IDs: ["CWE-79"]
Alternative ID: GHSA-wpq5-3366-mqw4
Finding: F008
Auto approve: 1