Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/22037?format=api",
    "vulnerability_id": "VCID-f3yg-vbeb-9qgr",
    "summary": "NiceGUI apps which use `ui.sub_pages` vulnerable to zero-click XSS\nAn unsafe implementation in the `pushstate` event listener used by `ui.sub_pages` allows an attacker to manipulate the fragment identifier of the URL, which _they can do despite being cross-site, using an iframe_.",
    "aliases": [
        {
            "alias": "CVE-2026-21873"
        },
        {
            "alias": "GHSA-mhpg-c27v-6mxr"
        }
    ],
    "fixed_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/46426?format=api",
            "purl": "pkg:pypi/nicegui@3.5.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-gk7h-2cu9-2uhm"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/nicegui@3.5.0"
        }
    ],
    "affected_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/46404?format=api",
            "purl": "pkg:pypi/nicegui@2.22.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-f3yg-vbeb-9qgr"
                },
                {
                    "vulnerability": "VCID-gk7h-2cu9-2uhm"
                },
                {
                    "vulnerability": "VCID-xv1m-pvjj-mfhn"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/nicegui@2.22.0"
        }
    ],
    "references": [
        {
            "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2026-21873",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "0.0002",
                    "scoring_system": "epss",
                    "scoring_elements": "0.06069",
                    "published_at": "2026-05-30T12:55:00Z"
                }
            ],
            "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-21873"
        },
        {
            "reference_url": "https://github.com/zauberzeug/nicegui",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/zauberzeug/nicegui"
        },
        {
            "reference_url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"
        },
        {
            "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21873",
            "reference_id": "CVE-2026-21873",
            "reference_type": "",
            "scores": [],
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21873"
        },
        {
            "reference_url": "https://github.com/advisories/GHSA-mhpg-c27v-6mxr",
            "reference_id": "GHSA-mhpg-c27v-6mxr",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/advisories/GHSA-mhpg-c27v-6mxr"
        },
        {
            "reference_url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr",
            "reference_id": "GHSA-mhpg-c27v-6mxr",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr"
        }
    ],
    "weaknesses": [
        {
            "cwe_id": 79,
            "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
            "description": "The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users."
        },
        {
            "cwe_id": 937,
            "name": "OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities",
            "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2013."
        },
        {
            "cwe_id": 1035,
            "name": "OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities",
            "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2017."
        }
    ],
    "exploits": [],
    "severity_range_score": null,
    "exploitability": null,
    "weighted_severity": null,
    "risk_score": null,
    "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-f3yg-vbeb-9qgr"
}