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Medium · 6.1 Scanner template Public exploit CVE-2025-25296 EUVD-2025-4106GHSA-wpq5-3366-mqw4PYSEC-2026-1504

Label Studio allows Cross-Site Scripting (XSS) via GET request to `/projects/upload-example` endpoint

Published Feb 14, 2025 · Updated Feb 14, 2025 · Assigned by GitHub_M

Vendor: HumanSignal Product: label-studio Package: label-studio Ecosystem: PyPI

Description

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.

Affected products

VendorProductAffectedFixed
HumanSignal label-studio < 1.16.0 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • math-x-io/CVE-2025-25296 ★ 3 · Mar 1, 2025

    Proof of Concept (POC) for the CVE-2025-25296 vulnerability affecting Label Studio versions prior to 1.16.0

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Automated scanner template

A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.

Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI label-studio < 1.16.0 1.16.0 GHSA-wpq5-3366-mqw4

References