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CVE-2026-54774

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, SamlSerializer skips final SignatureValue verification when a CoreWCF service validates SAML tokens using a non-X.509 signing token, allowing an attacker to reference a non-X.509 SecurityToken key identifier and bypass assertion signature verification. This issue is fixed in versions 1.8.1 and 1.9.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bb9944bf84603caeb928797f6acaedfd4e183022741a5194536f4ae8d593d9b3
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-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /containers/cna/problemTypes/0/descriptions/0

{"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:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /containers/cna/problemTypes/1/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:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /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:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /containers/cna/problemTypes/0/descriptions/0
{"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:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /containers/cna/problemTypes/1/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /containers/cna/references/1
{"name":"https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /containers/cna/references/2
{"name":"https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b","tags":["x_refsource_MISC"],"url":"https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /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:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /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:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /containers/cna/references/5
{"name":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c3526c66697cd9fc93401661545c2d9832a997a010d7efbd2351e2ec3c6e045e · sha256:d94372c8fe4f0ebc… · /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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