Read the docs
TI-2025-18950 Aliases CVE-2025-25296GHSA-wpq5-3366-mqw4

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

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01898 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed label-studio (HumanSignal): 1.16.0label-studio (PyPI): 1.16.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
HumanSignallabel-studiobefore 1.16.01.16.0Patch availableCNA
—label-studio (PyPI)before 1.16.01.16.0Patch availableGHSA-wpq5-3366-mqw4
  • label-studio VendorHumanSignal Affected before 1.16.0 Fixed in 1.16.0 Patch available CNA
  • label-studio (PyPI) Vendor— Affected before 1.16.0 Fixed in 1.16.0 Patch available GHSA-wpq5-3366-mqw4

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:humansignal:label_studio:*:*:*:*:*:*:*:*before 1.16.0VulnerableHumanSignal
  • cpe:2.3:a:humansignal:label_studio:*:*:*:*:*:*:*:* Versions before 1.16.0 Vulnerable ·HumanSignal

Remediation

  • Fix · CNA label-studio (HumanSignal) Fixed in 1.16.0
  • Fix · GHSA-wpq5-3366-mqw4 label-studio (PyPI) Fixed in 1.16.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-25296
  2. 2026-10-03 Alias added: GHSA-wpq5-3366-mqw4

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • TI-2023-23482 Label Studio has Hardcoded Django `SECRET_KEY` that can be Abused to Forge Session Tokens CVSS 3.1CRITICAL 9.8
  • TI-2025-18951 Label Studio allows Server-Side Request Forgery in the S3 Storage Endpoint CVSS 3.1HIGH 8.6
  • TI-2023-25457 Object Relational Mapper Leak Vulnerability in Filtering Task in Label Studio CVSS 3.1HIGH 7.5
  • TI-2026-17727 Label Studio vulnerable to full account takeover by chaining Stored XSS + IDOR in User Profile via custom_hotkeys field CVSS 4.0HIGH 8.6
  • TI-2025-30248 label-studio vulnerable to Cross-Site Scripting (Reflected) via the label_config parameter. CVSS 4.0HIGH 7.6
  • TI-2023-25455 Label Studio XSS Vulnerability on Avatar Upload CVSS 3.1HIGH 7.1
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences