NiceGUI On Air authentication issue

published 2025-01-06 22 mo ago modified 2026-07-07 4 mo ago also EUVD-2025-0044 , GHSA-v6jv-p6r8-j78w , PYSEC-2026-1705

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 links 1

pypi nicegui 2.9.1
zauberzeug nicegui 2.9.1

github.com/zauberzeug/nicegui@1621a4b commit

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 22 mo ago (2025-01-06)

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	nicegui	<2.9.1	2.9.1

Affected products

zauberzeug nicegui

Classification

Weakness

CWE-287 Improper Authentication

References

github.com /zauberzeug/nicegui/commit/1621a4ba6a06676b8094362d36623551e651adc1
web
github.com /zauberzeug/nicegui/security/advisories/GHSA-v6jv-p6r8-j78w
web
nvd.nist.gov /vuln/detail/CVE-2025-21618
advisory
github.com /zauberzeug/nicegui
package
pypi.org /project/nicegui
package
github.com /advisories/GHSA-v6jv-p6r8-j78w
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary