CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

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Summary

CVECVE-2026-54780
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 23:16:55 UTC
Updated2026-07-08 23:16:55 UTC
DescriptionCoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, the CoreWCF WS-Security 1.0 receive pipeline validates ds:SignedInfo SignatureMethod against the configured SecurityAlgorithmSuite but does not validate each ds:Reference DigestMethod, allowing a sender to use a rejected digest algorithm such as SHA-1 while the message is still accepted. This issue is fixed in versions 1.8.1 and 1.9.1.

Risk And Classification

Primary CVSS: v3.1 3.7 LOW from [email protected]

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

Problem Types: CWE-327 | CWE-757 | CWE-327 CWE-327: Use of a Broken or Risky Cryptographic Algorithm | CWE-757 CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CoreWCF CoreWCF affected >= 1.9.0, < 1.9.1 Not specified
CNA CoreWCF CoreWCF affected < 1.8.1 Not specified

References

ReferenceSourceLinkTags
github.com/CoreWCF/CoreWCF/commit/58742312117cc671e6e9c694c2f5f9f669c17136 [email protected] github.com
github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 [email protected] github.com
github.com/CoreWCF/CoreWCF/commit/fea67b2cd73a5a85115c325d504303ec7382e133 [email protected] github.com
github.com/CoreWCF/CoreWCF/commit/9104e581cff3d047ace5e179bfae86807a44be1f [email protected] github.com
github.com/CoreWCF/CoreWCF/security/advisories/GHSA-4v55-cpmv-3vcm [email protected] github.com
github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 [email protected] github.com
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