CVE-2019-20437 Cross-site scripting in n/a

Medium 6.1 Published 27 Jan 2020 Updated 5 Aug 2024

Authenticated attackers can execute arbitrary scripts via stored XSS in custom claim dialects within WSO2 Identity Server configurations.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2019-20437?

CVE-2019-20437 is a medium-severity cross-site scripting vulnerability in Wso2 Api Manager, published on 27 Jan 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2019-20437?

It affects 2 products.

Products include Wso2 Api Manager, Wso2 Identity Server.

How do I fix CVE-2019-20437?

No fix has been published for CVE-2019-20437 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2019-20437 being exploited?

There is no known exploitation of CVE-2019-20437 in the wild and no public exploit code.

All Wso2 Api Manager vulnerabilities

Sources

Also known as GHSA-pf48-fgcx-8ph4.