{"id":"CVE-2020-26244","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-26244","generatedAt":"2026-10-27T20:22:42.369Z","title":"2) JWA `none` algorithm was allowed in all flows.","description":"Python oic is a Python OpenID Connect implementation. In Python oic before version 1.2.1, there are several related cryptographic issues affecting client implementations that use the library. The issues are: 1) The IdToken signature algorithm was not checked automatically, but only if the expected algorithm was passed in as a kwarg. 2) JWA `none` algorithm was allowed in all flows. 3) oic.consumer.Consumer.parse_authz returns an unverified IdToken. The verification of the token was left to the discretion of the implementator. 4) iat claim was not checked for sanity (i.e. it could be in the future). These issues are patched in version 1.2.1.","published":"2020-12-02T20:15:13.000Z","lastModified":"2026-06-17T03:07:54.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-325","CWE-347"],"affected":["python openid connect project/python openid connect"],"epss":{"score":0.00832,"percentile":0.57357,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.83%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498","tags":["Patch","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfg","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://pypi.org/project/oic/","tags":["Product","Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/OpenIDC/pyoidc/commit/62f8d753fa17c8b1f29f8be639cf0b33afb02498","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/OpenIDC/pyoidc/releases/tag/1.2.1","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/OpenIDC/pyoidc/security/advisories/GHSA-4fjv-pmhg-3rfg","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://pypi.org/project/oic/","tags":["Product","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-26244","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}