CVE-2026-21872 — MEDIUM (6.1)

Q: How severe is CVE-2026-21872?

CVE-2026-21872 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-21872?

Check the references section above for vendor advisories and patch information. Affected products include: Zauberzeug Nicegui.

Vulnerability Description

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in version 3.5.0.

CVSS Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Zauberzeug	Nicegui	>= 2.22.0, < 3.5.0

Related Weaknesses (CWE)

CWE-79

References

https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0Release Notes
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-m7j5-rq9j-6jj9ExploitVendor Advisory

FAQ

What is CVE-2026-21872?

CVE-2026-21872 is a vulnerability with a CVSS score of 6.1 (MEDIUM). NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on th...

How severe is CVE-2026-21872?

CVE-2026-21872 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-21872?

Check the references section above for vendor advisories and patch information. Affected products include: Zauberzeug Nicegui.