CVE-2026-21872

MEDIUM
2026-01-08 [email protected] GHSA-m7j5-rq9j-6jj9
6.1
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

4
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 15, 2026 - 17:41 vuln.today
Public exploit code
CVE Published
Jan 08, 2026 - 10:15 nvd
MEDIUM 6.1

Tags

Python XSS Nicegui

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.

Analysis

NiceGUI versions 2.22.0 through 3.4.1 contain a stored cross-site scripting vulnerability in the click event listener of ui.sub_pages that executes attacker-controlled JavaScript when users click malicious links on the page. Public exploit code exists for this vulnerability, and affected users should upgrade to version 3.5.0 or later immediately. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

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Priority Score

51
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +30
POC: +20

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CVE-2026-21872 vulnerability details – vuln.today
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