CVE-2025-21618High· 7.5▾ TwilightNiceGUI On Air authentication issue
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.4%
0.4% → 0.4%
Once a user logins to one browser, all other browsers are logged in without entering password. Even incognito mode.
high
nicegui < 2.9.1Upgrade to a patched release:
nicegui 2.9.1Connected by shared product, vendor, weakness, or advisory.
CVE-2026-39844Medium· 5.9NiceGUI: Upload filename sanitization bypass via backslashes allows path traversal on Windows
CVE-2026-33332Medium· 5.3NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion
CVE-2026-25516Medium· 6.1NiceGUI's XSS vulnerability in ui.markdown() allows arbitrary JavaScript execution through unsanitized HTML content
CVE-2026-45554Medium· 5.3NiceGUI: Unauthenticated log-volume denial of service in dynamic resource routes
CVE-2026-45553High· 7.5NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()
CVE-2026-27156Medium· 6.1NiceGUI vulnerable to XSS via Code Injection during client-side element function execution