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Vulnerability details: VCID-dgqv-w1gf-qqby
Vulnerability ID VCID-dgqv-w1gf-qqby
Aliases CVE-2025-66469
GHSA-72qc-wxch-74mg
Summary NiceGUI Reflected XSS in ui.add_css, ui.add_scss, and ui.add_sass via Style Injection A Cross-Site Scripting (XSS) vulnerability exists in `ui.add_css`, `ui.add_scss`, and `ui.add_sass` functions in NiceGUI (v3.3.1 and earlier). These functions allow developers to inject styles dynamically. However, they lack proper sanitization or encoding for the JavaScript context they generate. An attacker can break out of the intended `<style>` or `<script>` tags by injecting closing tags (e.g., `</style>` or `</script>`), allowing for the execution of arbitrary JavaScript.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
There are no known severity scores.
Reference id Reference type URL
https://github.com/zauberzeug/nicegui
https://github.com/zauberzeug/nicegui/commit/a8fd25b7d5e23afb1952d0f60a1940e18b5f1ca8
CVE-2025-66469 https://nvd.nist.gov/vuln/detail/CVE-2025-66469
GHSA-72qc-wxch-74mg https://github.com/advisories/GHSA-72qc-wxch-74mg
GHSA-72qc-wxch-74mg https://github.com/zauberzeug/nicegui/security/advisories/GHSA-72qc-wxch-74mg
No exploits are available.
There are no known vectors.

No EPSS data available for this vulnerability.

Date Actor Action Source VulnerableCode Version
2026-06-02T04:49:05.843356+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/pypi/nicegui/CVE-2025-66469.yml 38.6.0