PT-2026-51070 · Nuget · Corewcf.Primitives
Publicado
2026-06-19
·
Atualizado
2026-06-19
·
CVE-2026-54773
CVSS v3.1
5.9
Média
| Vetor | AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
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).
Correção
Improper Verification of Cryptographic Signature
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Corewcf.Primitives