XSS in U-Tools Utools
CVE-2025-51966
A cross-site scripting (XSS) vulnerability exists in the PDF preview functionality of uTools thru 7.1.1. When a user previews a specially crafted PDF file, embedded JavaScript code executes within the application's privileged context, potentially allowing attackers to steal sensitive data or perform unauthorized actions.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (14.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- t1sts.github.io/2025/05/27/uTools-has-an-XSS-vulnerability/ (Exploit, Third Party Advisory)
- t1sts.github.io/2025/09/01/CVE-2025-51966/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-51966?
- CVE-2025-51966 is a medium-severity vulnerability in U-Tools Utools, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-09-02.
- How severe is CVE-2025-51966?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2025-51966 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.