CoreWCF CVE-2026-54773
MEDIUM
GHSA-jc6x-rj79-w4mx
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
AC:H reflects mandatory dual non-default prerequisites (endorsing token binding plus attacker-resolvable key); integrity-only impact because signature substitution bypasses authentication without exposing data.
Primary rating from Vendor (https://github.com/CoreWCF/CoreWCF).
CVSS VectorVendor: https://github.com/CoreWCF/CoreWCF
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
2DescriptionCVE.org
Impact
An unauthenticated remote attacker who can place a SOAP header lexically before wsse:Security can embed a ds:Signature of their choosing inside that header and cause the server to verify the attacker-supplied signature instead of the one carried in the security header.
Preconditions
Exploitation requires the endpoint be configured with an endorsing supporting token binding, and the attacker constructs a ds:Signature whose KeyInfo resolves through the receive-side token resolver to a key under the attacker’s control. Both are conditions outside the attacker’s direct control on a generic deployment.
Patches
Fixed in CoreWCF v1.8.1 and v1.9.1
Workarounds
Use a security token resolver that only accepts references to issuer-pinned X.509 chains (the default when expecting a static set of signing certificates).
AnalysisAI
Signature substitution in CoreWCF's WS-Security message processing allows a remote unauthenticated attacker to replace the server's cryptographic integrity check with a signature of the attacker's choosing, effectively forging authenticated SOAP messages. Affected versions of CoreWCF.Primitives perform a document-wide lookup for ds:Signature elements rather than scoping verification to the wsse:Security header, so an attacker-injected signature in a preceding SOAP header is found and verified first. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two specific server-side prerequisites - both outside the attacker's direct control - must be satisfied. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.9 (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N) reflects accurate signal: network-reachable, no authentication required, but high attack complexity because two conditions outside the attacker's direct control must be true simultaneously. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker targeting a CoreWCF service that uses an endorsing supporting token binding obtains or generates a key pair that the server's token resolver will accept - for example, by exploiting a permissive trust store or by possessing a certificate issued by an accepted CA. The attacker crafts a SOAP envelope in which a synthetic header, placed before wsse:Security in document order, embeds a ds:Signature element signed with their private key. … |
| Remediation | Upgrade CoreWCF.Primitives to v1.8.1 (for consumers on the 1.x stable branch) or v1.9.1 (for consumers on the 1.9.x branch), as confirmed by the GitHub Security Advisory at https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-jc6x-rj79-w4mx. … Detailed patch versions, workarounds, and compensating controls in full report. |
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