NiceGUI is a Python-based UI framework. Versions 2.24.2 and below are at risk for Cross-Site Scripting (XSS) when developers render unescaped user input into the DOM using ui.html(). NiceGUI did not enforce HTML or JavaScript sanitization, so applications that directly combine components like ui.input() with ui.html() or ui.chat_message with HTML content without escaping may allow attackers to execute arbitrary JavaScript in the user’s browser. Applications that do not pass untrusted input into ui.html() are not affected. This issue is fixed in version 3.0.0.
CVE-2025-53354
This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 93% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.1
- EG Score
- 6.1(medium)
- EG Risk
- —
- EPSS
- 8.7%
- KEV
- Not listed
Published
October 3, 2025
Last Modified
April 15, 2026
References (2)
- security-advisories@githubhttps://github.com/zauberzeug/nicegui/commit/4673dc35c94a0c7339e2164378b0977332e60775
- security-advisories@githubhttps://github.com/zauberzeug/nicegui/security/advisories/GHSA-8c95-hpq2-w46f
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| nicegui | 0.1.0 ... 3.0.0rc1 (286 versions) | 3.0.0 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 43× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
Showing the most recent 100 of 118 total refreshes for this CVE.
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Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2025-53354?
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Is CVE-2025-53354 actively exploited?
What is the CVSS score of CVE-2025-53354?
How do I remediate CVE-2025-53354?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-53354
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