Medium
NiceGUI is vulnerable to Reflected XSS attack
Type: advisorySources: OSV
NiceGUI is a Python-based UI framework. Versions 2.24.2 and below are at risk for Cross-Site Scripting (XSS) when developers render unescaped user input into the DOM using ui.html(). NiceGUI did not enforce HTML or JavaScript sanitization, so applications that directly combine components like ui.input() with ui.html() or ui.chat_message with HTML content without escaping may allow attackers to execute arbitrary JavaScript in the user’s browser. Applications that do not pass untrusted input into ui.html() are not affected. This issue is fixed in version 3.0.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-53354
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 23:53 UTC · Revision 1
Source evidence
NiceGUI is vulnerable to Reflected XSS attack
core-osv · Original sourcePublished 3 Oct 2025, 19:32 UTC
NiceGUI is a Python-based UI framework. Versions 2.24.2 and below are at risk for Cross-Site Scripting (XSS) when developers render unescaped user input into the DOM using ui.html(). NiceGUI did not enforce HTML or JavaScript sanitization, so applications that directly combine components like ui.input() with ui.html() or ui.chat_message with HTML content without escaping may allow attackers to execute arbitrary JavaScript in the user’s browser. Applications that do not pass untrusted input into ui.html() are not affected. This issue is fixed in version 3.0.0.
osv:CVE-2025-53354
Complete source record
{
"id": "3b1426719f3715d5a6ee3c8b66b3efb23c89f9f18dd8f9e3ee19ab6571fa0129",
"url": "https://osv.dev/vulnerability/CVE-2025-53354",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "NiceGUI is vulnerable to Reflected XSS attack",
"summary": "NiceGUI is a Python-based UI framework. Versions 2.24.2 and below are at risk for Cross-Site Scripting (XSS) when developers render unescaped user input into the DOM using ui.html(). NiceGUI did not enforce HTML or JavaScript sanitization, so applications that directly combine components like ui.input() with ui.html() or ui.chat_message with HTML content without escaping may allow attackers to execute arbitrary JavaScript in the user’s browser. Applications that do not pass untrusted input into ui.html() are not affected. This issue is fixed in version 3.0.0.",
"evidence": "osv:CVE-2025-53354",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-53354",
"aliases": [
"CVE-2025-53354",
"GHSA-8c95-hpq2-w46f",
"PYSEC-2026-1699"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/zauberzeug/nicegui",
"type": "GIT",
"events": [
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"introduced": "0"
},
{
"fixed": "6e1ec4fce4fc8bc0eabedfce5f652e8143400ccd"
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{
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}
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{
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
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"source": "REFERENCES_COMMIT"
}
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}
}
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}
}
],
"modified": "2026-10-28T02:30:45.115164077Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53354.json",
"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-8c95-hpq2-w46f",
"https://nvd.nist.gov/vuln/detail/CVE-2025-53354",
"https://github.com/zauberzeug/nicegui/commit/4673dc35c94a0c7339e2164378b0977332e60775"
],
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53354.json"
}
},
"related_cves": [
{
"value": "CVE-2025-53354",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 513240,
"published_at": "2025-10-03T19:32:21.521+00:00"
}