CVE-2019-20437

moderate-risk
Published 2020-01-28

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.

Do I need to act?

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0.78% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.1/10 Medium
NETWORK / LOW complexity

Affected Products (3)

Affected Vendors

Wso2

References (6)

Exploit https://cybersecurityworks.com/zerodays/cve-2019-20437-wso2.html
Vendor Advisory https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0635
Exploit https://github.com/cybersecurityworks/Disclosed/issues/20
Exploit https://cybersecurityworks.com/zerodays/cve-2019-20437-wso2.html
Vendor Advisory https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0635
Exploit https://github.com/cybersecurityworks/Disclosed/issues/20
35
/ 100
moderate-risk
Severity 23/34 · High
Exploitability 3/34 · Minimal
Exposure 9/34 · Low