XSS in Thingsboard
CVE-2025-34281
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Thingsboard — versions 0
Weakness classification (CWE)
References
- 596c5446-0ce5-4ba2-aa66-48b3b757a647 (third-party-advisory)
- 596c5446-0ce5-4ba2-aa66-48b3b757a647 (patch)
- 596c5446-0ce5-4ba2-aa66-48b3b757a647 (release-notes, Release Notes)
Frequently asked questions
- What is CVE-2025-34281?
- CVE-2025-34281 is a medium-severity vulnerability in Thingsboard, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-10-17.
- How severe is CVE-2025-34281?
- Medium severity. CVSS v3 base score is 5.4 out of 10.