UAA accepts SAML Encrypted Assertions authentication bypass_CVE-2026-41005

9 / 10

CRITICAL

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

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.

AI Analysis

UAA accepts SAML encrypted assertions, allowing authentication bypass due to incorrect treatment of XML encryption as a substitute for XML signatures

Basic Information

ID CVE-2026-41005

Source vmware

Published Jun 11, 2026 at 20:03

Affected Product

Vendor Cloud Foundry

Product UAA

Version 2.0.0

Affected Versions Cloud Foundry UAA 2.0.0
Cloud Foundry CF Deployment 0.0.0

CWE Classification

CWE-347

AI Assessment

AI Score 9 / 10

AI Severity Critical

Vendor Cloud Foundry

Product Cloud Foundry UAA

Version 2.0.0-78.13.0

References

www.cloudfoundry.org /blog/cve-2026-41005-uaa-accepts-saml-encrypted-assertions-authentication-bypass/

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