{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/50683?format=json","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=json","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=json","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"}