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Vulnerabilities

Vulnerability · CVE-2026-27156

NiceGUI is a Python-based UI framework.

Published Feb 24, 2026 · catalog updated Jun 17, 2026 · NiceGUI is a Python-based

Check if you run it

No confirmed exploitation is on record for CVE-2026-27156. EPSS is 0.28%. Act only if a listed version of NiceGUI is a Python-based is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (NiceGUI is a Python-based).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.28%
Remediation
Advisory link
Affected products
cpe zauberzeug/nicegui

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe zauberzeug/niceguiversion unspecified

How to fix CVE-2026-27156

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-27156. EPSS is 0.28%. Act only if a listed version of NiceGUI is a Python-based is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. 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

  2. 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

Sources

  • CVE.orgVulnerability recordCVE-2026-27156

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-27156

    30-day exploitation probability 0.3%

    first.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

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.