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

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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.

Published: 2025-02-14 Last update: 2025-08-25 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-25296 is rated High Exploit Risk (77.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 20.05%, 95th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +5.88% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2025-25296

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2025-25296

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-27 14.17% 20.05% +5.88%
2 2026-03-25 4.40% 14.17% +9.77%
3 2026-03-03 — 4.40% —

Full EPSS history (27 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-25296

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]

Weakness enumeration for CVE-2025-25296

GitHub Security Advisory for CVE-2025-25296

GHSA-wpq5-3366-mqw4 · Severity: medium · Ecosystem: pip — Label Studio allows Cross-Site Scripting (XSS) via GET request to `/projects/upload-example` endpoint

Affected software / configurations for CVE-2025-25296

Vendor Product Version Raw CPE
humansignal label_studio < 1.16.0 cpe:2.3:a:humansignal:label_studio:*:*:*:*:*:*:*:*

References for CVE-2025-25296

cvelogic Threat Intelligence