What’s Vulnerable › Vulnerabilities

CVE-2020-5402: UAA fails to check the state parameter when authenticating with external IDPs

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-02-27 · updated 2026-06-17
• Weakness: CWE-352

Description

In Cloud Foundry UAA, versions prior to 74.14.0, a CSRF vulnerability exists due to the OAuth2 state parameter not being checked in the callback function when authenticating with external identity providers.

Affected products

• Cloud Foundry cf-deployment: before 12.33.0 — fixed in 12.33.0
• Cloudfoundry User Account And Authentication: before 74.14.0 — fixed in 74.14.0

How to fix

Upgrade to a fixed version: Cloud Foundry cf-deployment 12.33.0; Cloudfoundry User Account And Authentication 74.14.0. Check the vendor advisory for mitigations.

References

• https://www.cloudfoundry.org/blog/cve-2020-5402
• https://www.cloudfoundry.org/blog/cve-2020-5402

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