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CVE-2026-54779 — Vulnerability in CoreWCF.Primitives — CVE Details

MEDIUM

CoreWCF: SAML token replay protection is inoperative

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

Summary

### Impact When enabling DetectReplayedTokens, a token can be replayed and will be detected despite it being reused. ### Patches Fixed in CoreWCF v1.8.1 and v1.9.1 ### Workarounds Provide your own implementation of `ITokenReplayCache` with the correct behavior.

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.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.9 score means for each attack dimension.

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

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

References

Frequently Asked Questions

What is CVE-2026-54779?
CoreWCF: SAML token replay protection is inoperative This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.9/10).
How do I check if my project is affected by CVE-2026-54779?
CVE-2026-54779 affects CoreWCF.Primitives. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54779 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.9

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-9jr3-rj99-8jq3

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