{"id":"CVE-2019-20437","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-20437","generatedAt":"2026-10-27T23:36:27.754Z","title":"When a custom claim dialect with an XSS payload is configured in the identity provider basic claim configuration, that payload gets executed, if a user picks up that dialect's URI as the provisioning claim in the advanced claim configuration of the same…","description":"An issue was discovered in WSO2 API Manager 2.6.0, WSO2 IS as Key Manager 5.7.0, and WSO2 Identity Server 5.8.0. When a custom claim dialect with an XSS payload is configured in the identity provider basic claim configuration, that payload gets executed, if a user picks up that dialect's URI as the provisioning claim in the advanced claim configuration of the same Identity Provider. The attacker also needs to have privileges to log in to the management console, and to add and update identity provider configurations.","published":"2020-01-28T01:15:12.000Z","lastModified":"2026-06-17T02:30:26.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["wso2/api manager","wso2/identity server"],"epss":{"score":0.01278,"percentile":0.69779,"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 (1.28%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://cybersecurityworks.com/zerodays/cve-2019-20437-wso2.html","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0635","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/cybersecurityworks/Disclosed/issues/20","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://cybersecurityworks.com/zerodays/cve-2019-20437-wso2.html","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0635","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/cybersecurityworks/Disclosed/issues/20","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-20437","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."}