CVE-2026-41005Network attack vector

Authentication bypass via encrypted unsigned SAML assertions

Published Jun 11, 2026 · Updated Jun 11, 2026

Improper SAML signature verification in Cloud Foundry UAA 2.0.0 through 78.13.0 allows remote attackers to impersonate users. The token endpoint and ACS accept encrypted assertions or responses without proving that a trusted IdP signed them, even though any party can encrypt data with the published SP key. No prior authentication is required; browser SSO additionally requires wantAssertionSigned to be false, and acceptance grants the forged identity's access.

CVSS severity9.5
Critical
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper SAML signature verification in Cloud Foundry UAA 2.0.0 through 78.13.0 allows remote attackers to impersonate users. The token endpoint and ACS accept encrypted assertions or responses without proving that a trusted IdP signed them, even though any party can encrypt data with the published SP key. No prior authentication is required; browser SSO additionally requires wantAssertionSigned to be false, and acceptance grants the forged identity's access.

The record

CVE
CVE-2026-41005
Published
Jun 11, 2026
Updated
Jun 11, 2026
Vendor
Cloud Foundry Foundation
Product
cf-deployment
Classifications
CWE-347, CAPEC-475, T1606.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.0 <57.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloud Foundry Foundation · cf-deploymentversion=0.0.0 <57.0.0
Cloud Foundry Foundation · User Account and Authentication (UAA)version=2.0.0 <78.14.0

Published CVSS scores

9.0Cloud Foundry FoundationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
9.5Cloud Foundry FoundationCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
CAPEC-475Signature Spoofing by Improper Validation
T1606.002Forge Web Credentials: SAML Tokens

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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