Label Studio — Xss (CVE-2026-22033)
Date: 2026-01
Affected: humansignal/label_studio
Attack vector: xss
Category: vulnerability-disclosure
Severity: Critical
CVE: CVE-2023-43791
CVE-2023-47115
CVE-2023-47116
CVE-2023-47117
CVE-2024-23633
CVE-2024-26152
CVE-2025-25296
CVE-2025-25297
CVE-2025-47783
CVE-2026-22033
CWE: CWE-200
CWE-284
CWE-79
CWE-918
CVSS: 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)

Label Studio is a multi-type data labeling and annotation tool. In 1.22.0 and earlier, a persistent stored cross-site scripting (XSS) vulnerability exists in the custom_hotkeys functionality of the application. An authenticated attacker (or one who can trick a user/administrator into updating their custom_hotkeys) can inject JavaScript code that executes in other users’ browsers when those users load any page using the templates/base.html template. Because the application exposes an API token endpoint (/api/current-user/token) to the browser and lacks robust CSRF protection on some API endpoints, the injected script may fetch the victim’s API token or call token reset endpoints — enabling full account takeover and unauthorized API access.


Mitigations:

Architectural layers (MAESTRO):