What’s Vulnerable › Vulnerabilities
CVE-2026-41005: UAA accepts SAML Encrypted Assertions authentication bypass
- Severity: critical (CVSS 9.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-11 · updated 2026-06-17
- Weakness: CWE-347
Description
Cloud Foundry UAA incorrectly treated XML encryption to the Service Provider (confidentiality) as a substitute for XML signatures from the Identity Provider (authenticity) in two SAML flows: the OAuth 2.0 SAML2 bearer grant (token endpoint) and browser SSO (ACS) when wantAssertionSigned is set to false. Assertions or responses that were unsigned but contained encrypted content could still be accepted. Encryption uses the SP's public key from published metadata, therefore, any party, not only a trusted IdP, can produce ciphertext UAA can decrypt; successful decryption therefore does not prove the IdP issued the message. Affected versions: Cloud Foundry UAA (uaa_release) 2.0.0 through 78.13.0. Cloud Foundry CF Deployment all versions through 56.1.0.
Affected products
- Cloud Foundry CF Deployment: before 57.0.0 — fixed in 57.0.0
- Cloud Foundry UAA: from 2.0.0 before 78.14.0 — fixed in 78.14.0
How to fix
Upgrade to a fixed version: Cloud Foundry CF Deployment 57.0.0; Cloud Foundry UAA 78.14.0. Check the vendor advisory for mitigations.
References
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