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CVE-2025-25296— Label Studio allows Cross-Site Scripting (XSS) via GET request to `/projects/upload-example` endpoint

Quick assessment

Affected
HumanSignal label-studio
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Label Studio是Heartex开源的一个开源数据标注工具。允许您使用简单明了的 UI 标记音频、文本、图像、视频和时间序列等数据类型，并导出为各种模型格式。 Label Studio 1.16.0之前版本存在跨站脚本漏洞，该漏洞源于允许通过GET请求注入任意HTML，并带有适当制作的查询参数。攻击者可以通过制作特殊格式的XML标签配置实现跨站脚本(XSS)攻击。

CVSS 6.1 · Medium EPSS 1.90% · P79

Public Exploits 1

Nuclei · 1 CVE-2025-25296.yaml [template]
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I. Basic Information for CVE-2025-25296

Vulnerability Information
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Vulnerability Title
Label Studio allows Cross-Site Scripting (XSS) via GET request to `/projects/upload-example` endpoint
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Label Studio 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Label Studio是Heartex开源的一个开源数据标注工具。允许您使用简单明了的 UI 标记音频、文本、图像、视频和时间序列等数据类型，并导出为各种模型格式。 Label Studio 1.16.0之前版本存在跨站脚本漏洞，该漏洞源于允许通过GET请求注入任意HTML，并带有适当制作的查询参数。攻击者可以通过制作特殊格式的XML标签配置实现跨站脚本(XSS)攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HumanSignal label-studio < 1.16.0 -

II. Public POCs for CVE-2025-25296

# POC Description Source Link Shenlong Link
1 Proof of Concept (POC) for the CVE-2025-25296 vulnerability affecting Label Studio versions prior to 1.16.0 https://github.com/math-x-io/CVE-2025-25296-POC POC Details
2 Label Studio prior to version 1.16.0 contains a cross-site scripting caused by rendering unsanitized user-provided HTML in the /projects/upload-example endpoint, letting attackers execute arbitrary JavaScript via crafted label_config in a GET request, exploit requires victims to visit malicious URL. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-25296.yaml POC Details
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III. Intelligence Information for CVE-2025-25296

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Patches & Fixes for CVE-2025-25296 (1)

Vendor Advisories for CVE-2025-25296 (1)

Same Patch Batch · HumanSignal · 2025-02-14 · 3 CVEs total

CVE-2025-25297 8.6 HIGH Label Studio allows Server-Side Request Forgery in the S3 Storage Endpoint
CVE-2025-25295 Label Studio has a Path Traversal Vulnerability via image Field

IV. Related Vulnerabilities

Same product: label-studio
Same vendor: HumanSignal
Same weakness: CWE-79

V. Comments for CVE-2025-25296

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