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CVE-2026-54784

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. In version 1.9.0, CoreWCF SPNEGO SecurityContextToken negotiation can expose the proof key recovered from the RSTR when TransportWithMessageCredential with Windows client credentials and session establishment are used, allowing an observer to impersonate the authenticated Windows principal and decrypt or forge WS-SecureConversation traffic. This issue is fixed in version 1.9.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:df89de6d10b6836c59d172c7c2fdcf1377ba1ae8f2a25b5ef34761cf63b8fce6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-523","description":"CWE-523: Unprotected Transport of Credentials","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-311","description":"CWE-311: Missing Encryption of Sensitive Data","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"CoreWCF","vendor":"CoreWCF","versions":[{"status":"affected","version":">= 1.9.0, < 1.9.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-523","description":"CWE-523: Unprotected Transport of Credentials","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-311","description":"CWE-311: Missing Encryption of Sensitive Data","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/CoreWCF/CoreWCF/commit/2afae08b2fa5288428df89e8161116b816cf6b4b","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/2afae08b2fa5288428df89e8161116b816cf6b4b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/references/1
{"name":"https://github.com/CoreWCF/CoreWCF/commit/f216aa6929d41dc99cee098b1e69c260ec4c41c7","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/f216aa6929d41dc99cee098b1e69c260ec4c41c7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/references/2
{"name":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/references/3
{"name":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-2288-8h3r-cqgg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-2288-8h3r-cqgg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ef86a9ec38f70f6057897db1ec8a125dc10b547b8f6fcdee6ea8aec7b0417491 · sha256:a39a44fe359e9822… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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