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CVE-2026-54784 — Vulnerability in CoreWCF.Primitives — CVE Details

HIGH

CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality

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

Summary

### Impact When the proof key recovered from the RSTR can be observed by a party that is not the legitimate client, that party can impersonate the authenticated Windows principal for the lifetime of the SCT (default ~10 hours) and decrypt or forge any subsequent WS‑SecureConversation traffic that uses keys derived from the SCT. #### Preconditions Using security mode TransportWithMessageCredential with client credential type Windows, along with session establishment (which triggers use of WS-SecureConversation). ### Patches Fixed in CoreWCF v1.9.1 ### Workarounds Ensure communication is protected by SSL/TLS to prevent capturing of SCT negotiation handshake.

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 1.9.1 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 (1)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
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) 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-2026-54784?
CoreWCF: SPNEGO SecurityContextToken proof key wrapped without confidentiality 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-2026-54784?
CVE-2026-54784 affects CoreWCF.Primitives. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54784 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-2288-8h3r-cqgg

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