FKIE_CVE-2026-21872

Vulnerability from fkie_nvd - Published: 2026-01-08 10:15 - Updated: 2026-01-15 17:41
Severity
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in version 3.5.0.
References
security-advisories@github.comhttps://github.com/zauberzeug/nicegui/releases/tag/v3.5.0Release Notes
security-advisories@github.comhttps://github.com/zauberzeug/nicegui/security/advisories/GHSA-m7j5-rq9j-6jj9Exploit, Vendor Advisory
Impacted products
Vendor Product Version
zauberzeug nicegui *
To clipboard 

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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "37903F79-6269-4F0A-939A-36F3E3CC41B3",
              "versionEndExcluding": "3.5.0",
              "versionStartIncluding": "2.22.0",
              "vulnerable": true
            }
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          "negate": false,
          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in version 3.5.0."
    },
    {
      "lang": "es",
      "value": "NiceGUI es un framework de interfaz de usuario (UI) basado en Python. Desde las versiones 2.22.0 hasta la 3.4.1, una implementaci\u00f3n insegura en el oyente de eventos de clic utilizado por ui.sub_pages, combinada con la renderizaci\u00f3n de enlaces controlada por el atacante en la p\u00e1gina, causa XSS cuando el usuario hace clic activamente en el enlace. Este problema ha sido parcheado en la versi\u00f3n 3.5.0."
    }
  ],
  "id": "CVE-2026-21872",
  "lastModified": "2026-01-15T17:41:02.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-01-08T10:15:55.470",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-m7j5-rq9j-6jj9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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