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PatchSiren cyber security CVE debrief

CVE-2026-41005 Cloud Foundry CVE debrief

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.

Vendor
Cloud Foundry
Product
UAA
CVSS
CRITICAL 9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-11
Original CVE updated
2026-06-12
Advisory published
2026-06-11
Advisory updated
2026-06-12

Who should care

Users of Cloud Foundry UAA (uaa_release) 2.0.0 through 78.13.0 and Cloud Foundry CF Deployment all versions through 56.1.0.

Technical summary

The vulnerability allows for an authentication bypass due to incorrect handling of SAML encryption and signatures. Specifically, the UAA would accept unsigned SAML assertions or responses if they were encrypted, using the Service Provider's public key for decryption. This means any party can create encrypted content that the UAA can decrypt, without proving the Identity Provider issued the message.

Defensive priority

CRITICAL

Recommended defensive actions

  • Upgrade to Cloud Foundry UAA (uaa_release) version 78.13.1 or later.
  • Upgrade to Cloud Foundry CF Deployment version 56.1.1 or later.

Evidence notes

CVE-2026-41005 has been assessed as CRITICAL with a CVSS score of 9. Affected versions include Cloud Foundry UAA (uaa_release) 2.0.0 through 78.13.0 and Cloud Foundry CF Deployment all versions through 56.1.0.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41005 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41005

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-41005 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41005

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

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

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.