Vulnerability · CVE-2026-27156
NiceGUI is a Python-based UI framework.
Published Feb 24, 2026 · corrected/updated Jun 17, 2026 · zauberzeug nicegui · evidence confidence medium
NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on client-side elements ( , , , and others) use an fallback in the JavaScript-side function. When user-controlled input is passed as the method name, an attacker can inject arbitrary JavaScript that executes in the victim's browser. Additionally, and used string interpolation instead of for the method/property name, allowing quote injection to break out of the intended string context. Version 3.8.0 contains a fix.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-27156 is a medium public vulnerability record for zauberzeug nicegui. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether zauberzeug nicegui is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: zauberzeug/nicegui. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 6.1. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-79. Sources contributing to this record: cve_org, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Feb 24, 2026 · NIST NVD
Detected
NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on client-side elements ( , , , and others) use an fallback in the JavaScript-side function. When user-controlled input is passed as the method name, an attacker can inject arbitrary JavaScript that executes in the victim's browser. Additionally, and used string interpolation instead of for th
Jun 17, 2026 · NIST NVD
Updated
NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on client-side elements ( , , , and others) use an fallback in the JavaScript-side function. When user-controlled input is passed as the method name, an attacker can inject arbitrary JavaScript that executes in the victim's browser. Additionally, and used string interpolation instead of for th
Affected
- cpe zauberzeug/niceguiversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-27156
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-27156
NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on client-side elements ( , , , and others) use an fallback in the JavaScript-side `runMeth
nvd.nist.gov