CVE-2025-21618: high-severity vulnerability in zauberzeug nicegui
NiceGUI On Air authentication issue
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
NiceGUI is an easy-to-use, Python-based UI framework. Prior to 2.9.1, authenticating with NiceGUI logged in the user for all browsers, including browsers in incognito mode. This vulnerability is fixed in 2.9.1.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
zauberzeug · niceguiRelated CVEs — zauberzeug nicegui
In the same product, most dangerous first.
CVE-2026-25732HIGHNiceGUI's Path Traversal via Unsanitized FileUpload.name Enables Arbitrary File WriteEPSS 3.4%CVE-2025-66645HIGHNiceGUI Path Traversal Vulnerability in app.add_media_files() Allows Arbitrary File ReadingEPSS 1.2%CVE-2024-32005HIGHLocal File Inclusion in NiceGUI leaflet componentEPSS 0.8%CVE-2026-33332MEDIUMNiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustionEPSS 0.6%CVE-2026-21874MEDIUMNiceGUI has Redis connection leak via tab storage causes service degradationEPSS 0.6%CVE-2026-39844MEDIUMNiceGUI has a Path Traversal in NiceGUI Upload Filename on Windows via Backslash Bypass of PurePosixPath SanitizationEPSS 0.4%