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CVE-2026-54783 — CoreWCF: XML Signature Wrapping in...

HIGH

CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification allows replay of captured signed messages

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

Summary

### Impact The attacker, with one captured signed SOAP envelope from a victim and no other privileges, can invoke arbitrary operations on the service as the victim principal for the lifetime of the captured signing key. There is no rate limit on replays. The DetectReplays setting on transport-security bindings does not mitigate the issue because the attack does not reuse the original timestamp — the fresh timestamp in the wsse:Security header is what the replay-detection logic inspects. ### Patches Fixed in CoreWCF v1.8.1 and v1.9.1 ### Workarounds Ensure communication is protected by SSL/TLS to prevent capturing of signed SOAP envelope.

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-294
  • 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-2026-54783?
CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification allows replay of captured signed messages 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-2026-54783?
CVE-2026-54783 affects CoreWCF.Primitives. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54783 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-gqv6-pwcg-87r8

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