What’s Vulnerable › Vulnerabilities

CVE-2019-20437

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-01-28 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• WSO2 API Manager: 2.6.0
• WSO2 Identity Server: 5.7.0, 5.8.0

References

• https://cybersecurityworks.com/zerodays/cve-2019-20437-wso2.html
• https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0635
• https://github.com/cybersecurityworks/Disclosed/issues/20
• https://cybersecurityworks.com/zerodays/cve-2019-20437-wso2.html
• https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0635
• https://github.com/cybersecurityworks/Disclosed/issues/20

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