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High

CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

  • Disclosed: 19.06.2026
  • Updated: 11.10.2026 11:23

Impact

When a service is configured to validate SAML tokens using a method other than X.509 certificate signing, the final signature verification is skipped.

Preconditions

The service is configured to authenticate using SAML tokens and an out of band token resolver (commonly the IssuerTokenResolver of IssuedTokenServiceCredential) holds a non-X.509 SecurityToken whose key identifier the attacker can reference in the assertion’s <KeyInfo> - for example a BinarySecretSecurityToken representing the symmetric proof key issued by a WS-Trust symmetric-key holder-of-key STS.

Patches

Fixed in CoreWCF v1.8.1 and v1.9.1

Workarounds

None

Affected software

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PlatformPackageVulnerable versionsFixed in
.NET (NuGet) CoreWCF.Primitives < 1.8.1, >= 1.9.0, < 1.9.1 1.8.1, 1.9.1

References

CVSS score 7.4/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE)
CWE-345, CWE-347
Platform
.NET (NuGet)
Package
CoreWCF.Primitives
Disclosed
19.06.2026
Updated
11.10.2026 11:23

Sources and licenses

OSV / GitHub Advisory Database - GHSA-rpj7-hr7h-w6p9 - CC BY 4.0

Vulnerability history: CoreWCF.Primitives

All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries
8
First → latest
06.2026 06.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 4
  • Medium 2
  • Low 1

Disclosures per year

  1. CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality
    High · 7.4 CVE-2026-54784 >= 1.9.0, < 1.9.1 1.9.1
  2. CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification allows replay of captured signed messages
    High · 7.4 CVE-2026-54783 < 1.8.1, >= 1.9.0, < 1.9.1 1.8.1, 1.9.1
  3. CoreWCF: Authentication bypass in CoreWCF SAML 1.1 / 2.0 token signature validation
    Critical · 10.0 CVE-2026-54782 < 1.8.1, >= 1.9.0, < 1.9.1 1.8.1, 1.9.1
  4. CoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced
    High · 7.4 CVE-2026-54781 < 1.8.1, >= 1.9.0, < 1.9.1 1.8.1, 1.9.1
  5. CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass
    Low · 3.7 CVE-2026-54780 < 1.8.1, >= 1.9.0, < 1.9.1 1.8.1, 1.9.1
  6. CoreWCF: SAML token replay protection is inoperative
    Medium · 5.9 CVE-2026-54779 < 1.8.1, >= 1.9.0, < 1.9.1 1.8.1, 1.9.1
  7. CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate this entry
    High · 7.4 CVE-2026-54774 < 1.8.1, >= 1.9.0, < 1.9.1 1.8.1, 1.9.1
  8. CoreWCF: WS-Security signature substitution via document-wide Signature lookup
    Medium · 5.9 CVE-2026-54773 < 1.8.1, >= 1.9.0, < 1.9.1 1.8.1, 1.9.1

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