CVE-2026-54781

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Source
https://cve.org/CVERecord?id=CVE-2026-54781
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54781.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54781
Aliases
Published
2026-07-08T22:19:40Z
Modified
2026-10-28T02:30:45Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
CoreWCF: SAML SubjectConfirmation methods and holder-of-key proof keys are not enforced
Details

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 token validation does not enforce SubjectConfirmation method URIs or holder-of-key proof keys in SamlSecurityTokenHandler, allowing holder-of-key downgrade or custom confirmation method assertions to authenticate a subject without proving authority over the assertion. This issue is fixed in versions 1.8.1 and 1.9.1.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-287",
        "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54781.json"
}
References

Affected packages

Git / github.com/corewcf/corewcf

Affected ranges

Type
GIT
Repo
https://github.com/corewcf/corewcf
Events
Introduced
39b2f02978e497955a560c72b5ccdff5c0dbcda1
Fixed
1f7a0811da5128db40fd7b868ae0aac0c581f91f
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7c0920fe16adc497efae82881ac0f1e4d7ac98d0
Fixed
6a99df3242f54acd6f89edfd6050430b72d0c685
Fixed
86dd3232b6b8aaf32281be9e8d798afad6145d58
Fixed
9eb9b46d1c2af06fb71f656a02f4d5b4649c1f03
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "1.9.0"
                },
                {
                    "fixed": "1.9.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.8.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "6a99df3242f54acd6f89edfd6050430b72d0c685"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "86dd3232b6b8aaf32281be9e8d798afad6145d58"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "9eb9b46d1c2af06fb71f656a02f4d5b4649c1f03"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v1.8.1",
            "range": [
                {
                    "fixed": "7c0920fe16adc497efae82881ac0f1e4d7ac98d0"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "original_tag": "v1.9.1",
            "range": [
                {
                    "fixed": "1f7a0811da5128db40fd7b868ae0aac0c581f91f"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v1.*
v1.8.0
v1.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54781.json"