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CVE-2026-54774 — Vulnerability in CoreWCF.Primitives — CVE Details

HIGH

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

Published June 19, 2026Updated June 19, 2026Source: osv

Summary

### 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

Advisory Timeline

  • First published June 19, 2026 (115 days ago).
  • Last revised June 19, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update CoreWCF.Primitives to 1.8.1 or later
dotnet add package CoreWCF.Primitives --version 1.8.1
NuGet
Update CoreWCF.Primitives to 1.9.1 or later
dotnet add package CoreWCF.Primitives --version 1.9.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
CoreWCF.Primitives
nuget
0.1.0, 0.1.0-preview, 0.1.0-preview-2, 0.2.0 (+28 more)1.8.1
CoreWCF.Primitives
nuget
1.9.01.9.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-345
    Insufficient Verification of Data AuthenticityMITRE
  • CWE-347
    Improper Verification of Cryptographic SignatureMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.4 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

References

Frequently Asked Questions

What is CVE-2026-54774?
CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.4/10).
How do I check if my project is affected by CVE-2026-54774?
CVE-2026-54774 affects CoreWCF.Primitives. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54774 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.4

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-rpj7-hr7h-w6p9

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  • CVE-2026-54779
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  • CVE-2026-54773
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    CoreWCF: WS-Security signature substitution via document-wide Signature lookup

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