Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/50683?format=api",
    "vulnerability_id": "VCID-z4uj-gecb-1ucd",
    "summary": "Authlib: Setting `alg: none` and a blank signature appears to bypass signature verification\nAfter upgrading the library from 1.5.2 to 1.6.0 (and the latest 1.6.5) it was noticed that previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.",
    "aliases": [
        {
            "alias": "CVE-2026-28802"
        },
        {
            "alias": "GHSA-7wc2-qxgw-g8gg"
        }
    ],
    "fixed_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/49676?format=api",
            "purl": "pkg:pypi/authlib@1.6.7",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-hrf7-xz6n-efcg"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/authlib@1.6.7"
        }
    ],
    "affected_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/49674?format=api",
            "purl": "pkg:pypi/authlib@1.6.5",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-hrf7-xz6n-efcg"
                },
                {
                    "vulnerability": "VCID-z4uj-gecb-1ucd"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/authlib@1.6.5"
        }
    ],
    "references": [
        {
            "reference_url": "https://github.com/authlib/authlib",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/authlib/authlib"
        },
        {
            "reference_url": "https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75"
        },
        {
            "reference_url": "https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7",
            "reference_id": "",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7"
        },
        {
            "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28802",
            "reference_id": "CVE-2026-28802",
            "reference_type": "",
            "scores": [],
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28802"
        },
        {
            "reference_url": "https://github.com/advisories/GHSA-7wc2-qxgw-g8gg",
            "reference_id": "GHSA-7wc2-qxgw-g8gg",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/advisories/GHSA-7wc2-qxgw-g8gg"
        },
        {
            "reference_url": "https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8gg",
            "reference_id": "GHSA-7wc2-qxgw-g8gg",
            "reference_type": "",
            "scores": [],
            "url": "https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8gg"
        }
    ],
    "weaknesses": [
        {
            "cwe_id": 347,
            "name": "Improper Verification of Cryptographic Signature",
            "description": "The product does not verify, or incorrectly verifies, the cryptographic signature for data."
        },
        {
            "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-z4uj-gecb-1ucd"
}