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NVD Vulnerability Details :
CVE-2026-21871
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-08 Jan, 2026 | 10:15
Updated At-15 Jan, 2026 | 17:40

NiceGUI is a Python-based UI framework. From versions 2.13.0 to 3.4.1, there is a XSS risk in NiceGUI when developers pass attacker-controlled strings into ui.navigate.history.push() or ui.navigate.history.replace(). These helpers are documented as History API wrappers for updating the browser URL without page reload. However, if the URL argument is embedded into generated JavaScript without proper escaping, a crafted payload can break out of the intended string context and execute arbitrary JavaScript in the victim’s browser. Applications that do not pass untrusted input into ui.navigate.history.push/replace are not affected. This issue has been patched in version 3.5.0.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.1MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 6.1
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CPE Matches
zauberzeug
zauberzeug
>>nicegui>>Versions from 2.13.0(inclusive) to 3.5.0(exclusive)
cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-79Primarysecurity-advisories@github.com
CWE ID: CWE-79
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0security-advisories@github.com
Release Notes
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-7grm-h62g-5m97security-advisories@github.com
Exploit
Vendor Advisory
Hyperlink: https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0
Source: security-advisories@github.com
Resource:
Release Notes
Hyperlink: https://github.com/zauberzeug/nicegui/security/advisories/GHSA-7grm-h62g-5m97
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory
Change History
0Changes found
Details not found