CVE-2026-41005 UAA accepts SAML Encrypted Assertions authentication bypass
Attackers can bypass authentication in Cloud Foundry UAA by submitting encrypted but unsigned SAML assertions when signature verification is disabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-41005?
CVE-2026-41005 is a critical authentication bypass vulnerability in Cloud Foundry CF Deployment, published on 11 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2026-41005?
How do I fix CVE-2026-41005?
No fix has been published for CVE-2026-41005 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-41005 being exploited?
There is no known exploitation of CVE-2026-41005 in the wild and no public exploit code.
Sources
Also known as GHSA-wx8w-j86h-c458.