CVE-2026-21873

HIGH
2026-01-08 [email protected] GHSA-mhpg-c27v-6mxr
7.2
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
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 - 17:45 vuln.today
Public exploit code
CVE Published
Jan 08, 2026 - 10:15 nvd
HIGH 7.2

Tags

Python Nicegui

Description

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the pushstate event listener used by ui.sub_pages allows an attacker to manipulate the fragment identifier of the URL, which they can do despite being cross-site, using an iframe. This issue has been patched in version 3.5.0.

Analysis

NiceGUI versions 2.22.0 through 3.4.1 contain a cross-site DOM-based XSS vulnerability in the pushstate event listener for ui.sub_pages that allows attackers to manipulate URL fragment identifiers via iframe injection. Public exploit code exists for this vulnerability, and affected users should upgrade to version 3.5.0 or later as no patch is currently available for vulnerable versions.

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Verify anti-CSRF tokens and content security policies are enforced.

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Priority Score

56
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +36
POC: +20

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CVE-2026-21873 vulnerability details – vuln.today
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