CVE-2025-53354: PYSEC-2026-1699 - NiceGUI has a Reflected XSS

CVE-2025-53354 · Severity: low · CVSS 3.1 · Published 2026-07-07

NiceGUI has a Reflected XSS

Technologies: nicegui (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2025-53354 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-53354 being exploited in the wild.
How severe is CVE-2025-53354?
Low severity, with a CVSS score of 3.1, published 7 July 2026.
Which products and versions are affected?
nicegui (PyPI) ECOSYSTEM:introduced=0,fixed=3.0.0.
Is there a fix for CVE-2025-53354?
Yes. nicegui (PyPI): upgrade to 3.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-53354?
Check whether you run nicegui (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • nicegui (PyPI): upgrade to 3.0.0 or later
    pip install "nicegui>=3.0.0"

Affected products

  • nicegui (PyPI) ECOSYSTEM:introduced=0,fixed=3.0.0

Identifiers

  • CVE-2025-53354
  • GHSA-8c95-hpq2-w46f
  • PYSEC-2026-1699

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