CVE-2025-21618 json
NiceGUI On Air authentication issue
published last yr. modified 4mo 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
Summary
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
Is CVE-2025-21618 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-09).
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
- CVE List CVE-2025-21618
- GitHub Advisory GHSA-v6jv-p6r8-j78w
- NVD CVE-2025-21618
- OSV PYSEC-2026-1705
Fencer Intel 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.