CVE-2025-34281

Stored Cross-Site Scripting (XSS) in ThingsBoard

State: Published
Severity: 6.2 Medium
Published: Oct 17, 2025
Updated: Feb 10, 2026
Reserved: Apr 15, 2025

Description

ThingsBoard in versions prior to v4.2.1 allows an authenticated user to upload malicious SVG images via the "Image Gallery", leading to a Stored Cross-Site Scripting (XSS) vulnerability. The exploit can be triggered when any user accesses the public API endpoint of the malicious SVG images, or if the malicious images are embedded in an `iframe` element, during a widget creation, deployed to any page of the platform (e.g., dashboards), and accessed during normal operations. The vulnerability resides in the `ImageController`, which fails to restrict the execution of JavaScript code when an image is loaded by the user's browser. This vulnerability can lead to the execution of malicious code in the context of other users' sessions, potentially compromising their accounts and allowing unauthorized actions.

Scores

CVSS	Score	Vector	Source
4.0	6.2 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N	Checkmarx

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Affected Products

Product	Versions
thingsboardthingsboard	before 4.2.1Affected

References

https://advisory.checkmarx.net/advisory/CVE-2025-34281/third-party-advisory
https://github.com/thingsboard/thingsboard/commit/b2ae6f92d12206ea185a2e882945a6b69234bf03patch
https://github.com/thingsboard/thingsboard/releases/tag/v4.2.1release-notes

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