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CVE-2026-54782

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF SAML 1.1 and SAML 2.0 token validation does not correctly resolve the issuer signing key or require signed tokens when IdentityConfiguration is used with federated bindings, allowing an unauthenticated remote attacker to impersonate any principal the trusted STS could issue. This issue is fixed in versions 1.8.1 and 1.9.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:006814b2e86eed597361141dbe8bed131221f9e91561ca8dc370e57ddad09cca
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-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /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"},{"status":"affected","version":"< 1.8.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/CoreWCF/CoreWCF/commit/0b8c8af851260e85e8402af53233d1b8f87dfb6f","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/0b8c8af851260e85e8402af53233d1b8f87dfb6f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/references/1
{"name":"https://github.com/CoreWCF/CoreWCF/commit/0e63c2cca55763d8be6b226a234579280a09e7b6","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/0e63c2cca55763d8be6b226a234579280a09e7b6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/references/2
{"name":"https://github.com/CoreWCF/CoreWCF/commit/e5cc9b6a4ecc102a50d782093bfc72e0790abe3d","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/e5cc9b6a4ecc102a50d782093bfc72e0790abe3d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/references/3
{"name":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/references/4
{"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:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /containers/cna/references/5
{"name":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-xjr9-gg9q-jx3v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-xjr9-gg9q-jx3v"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5b64227973c0b859093a3a621a6b46d0d94783f6a7618b1f520c48b658fe1d3e · sha256:094df065dc0ecb44… · /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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