CVE-2026-54780
Published:June 19, 2026
Updated:June 21, 2026
Impact CoreWCF’s WS-Security 1.0 receive pipeline validates the "SignatureMethod" of an incoming "ds:SignedInfo" against the configured "SecurityAlgorithmSuite", but does not validate the "DigestMethod" declared on each "ds:Reference". As a result, a sender can populate "ds:SignedInfo" with "SignatureMethod" values the suite accepts (for example rsa-sha256 under Basic256Sha256) while declaring a per-reference "DigestMethod" the suite rejects (for example http://www.w3.org/2000/09/xmldsig#sha1). The signature is then verified where it permits SHA-1 digests, and the message is accepted. Patches Fixed in CoreWCF v1.8.1 and v1.9.1 Workarounds None
Affected Packages
corewcf.primitives (DOT_NET):
Affected version(s) >=0.1.0.8 <1.8.1Fix Suggestion:
Update to version 1.8.1https://github.com/CoreWCF/CoreWCF.git (GITHUB):
Affected version(s) =v1.9.0 <v1.9.1Fix Suggestion:
Update to version v1.9.1https://github.com/CoreWCF/CoreWCF.git (GITHUB):
Affected version(s) >=v0.3.0 <v1.8.1Fix Suggestion:
Update to version v1.8.1corewcf.primitives (NUGET):
Affected version(s) =1.9.0 <1.9.1Fix Suggestion:
Update to version 1.9.1corewcf.primitives (NUGET):
Affected version(s) >=0.1.0-preview <1.8.1Fix Suggestion:
Update to version 1.8.1Related Resources (2)
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Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE