PT-2026-51081 · Nuget · Corewcf.Primitives

Published 2026-06-19 · Updated 2026-06-19 · CVE-2026-54784

OSV

CVSS v3.1

7.4

High

Base vector

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

Impact

When the proof key recovered from the RSTR can be observed by a party that is not the legitimate client, that party can impersonate the authenticated Windows principal for the lifetime of the SCT (default ~10 hours) and decrypt or forge any subsequent WS‑SecureConversation traffic that uses keys derived from the SCT.

Preconditions

Using security mode TransportWithMessageCredential with client credential type Windows, along with session establishment (which triggers use of WS-SecureConversation).

Patches

Fixed in CoreWCF v1.9.1

Workarounds

Ensure communication is protected by SSL/TLS to prevent capturing of SCT negotiation handshake.

Fix

Missing Encryption of Sensitive Data

Weakness Enumeration

CWE-523

CWE-311

Related Identifiers

CVE-2026-54784

GHSA-2288-8H3R-CQGG

Affected Products

Corewcf.Primitives

References · 3

• https://osv.dev/vulnerability/GHSA-2288-8h3r-cqgg · Vendor Advisory
• https://github.com/CoreWCF/CoreWCF · Note
• https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-2288-8h3r-cqgg · Note