CVE-2019-20436

Name: CVE-2019-20436
Creator: NVD / NIST
Published: 2020-01-28T01:15:11.957+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.37%

Last modified Jun 17, 2026

CVE-2019-20436 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. If there is a claim dialect configured with an XSS payload in the dialect URI, and a user picks up this dialect's URI and adds it as the service provider claim dialect while configuring the service provider, that payload gets executed. EPSS estimates a 1.37% chance of exploitation in the next 30 days.

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. If there is a claim dialect configured with an XSS payload in the dialect URI, and a user picks up this dialect's URI and adds it as the service provider claim dialect while configuring the service provider, that payload gets executed. The attacker also needs to have privileges to log in to the management console, and to add and configure claim dialects.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.37%

68.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Wso2	Api Manager	2.6.0
Wso2	Identity Server	5.7.0
Wso2	Identity Server	5.8.0

References

https://cybersecurityworks.com/zerodays/cve-2019-20436-wso2.htmlExploit, Third Party Advisory
https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0634Vendor Advisory
https://github.com/cybersecurityworks/Disclosed/issues/19Exploit, Third Party Advisory
https://cybersecurityworks.com/zerodays/cve-2019-20436-wso2.htmlExploit, Third Party Advisory
https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2019-0634Vendor Advisory
https://github.com/cybersecurityworks/Disclosed/issues/19Exploit, Third Party Advisory

Timeline

Published: Jan 28, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-20436?

How severe is CVE-2019-20436?

CVE-2019-20436 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.37% probability of exploitation in the next 30 days.

How do I fix CVE-2019-20436?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-20436?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST