Vulnerability Details CVE-2026-21873
NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the pushstate event listener used by ui.sub_pages allows an attacker to manipulate the fragment identifier of the URL, which they can do despite being cross-site, using an iframe. This issue has been patched in version 3.5.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 11.3%
CVSS Severity
CVSS v3 Score 7.2
References
Products affected by CVE-2026-21873
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cpe:2.3:a:zauberzeug:nicegui:2.22.0
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cpe:2.3:a:zauberzeug:nicegui:2.22.1
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cpe:2.3:a:zauberzeug:nicegui:2.22.2
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cpe:2.3:a:zauberzeug:nicegui:2.23.0
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cpe:2.3:a:zauberzeug:nicegui:2.23.1
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cpe:2.3:a:zauberzeug:nicegui:2.23.2
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cpe:2.3:a:zauberzeug:nicegui:2.23.3
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cpe:2.3:a:zauberzeug:nicegui:2.24.0
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cpe:2.3:a:zauberzeug:nicegui:2.24.1
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cpe:2.3:a:zauberzeug:nicegui:2.24.2
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cpe:2.3:a:zauberzeug:nicegui:3.0.0
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cpe:2.3:a:zauberzeug:nicegui:3.0.1
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cpe:2.3:a:zauberzeug:nicegui:3.0.2
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cpe:2.3:a:zauberzeug:nicegui:3.0.3
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cpe:2.3:a:zauberzeug:nicegui:3.0.4
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cpe:2.3:a:zauberzeug:nicegui:3.1.0
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cpe:2.3:a:zauberzeug:nicegui:3.2.0
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cpe:2.3:a:zauberzeug:nicegui:3.3.0
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cpe:2.3:a:zauberzeug:nicegui:3.3.1
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cpe:2.3:a:zauberzeug:nicegui:3.4.0