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EUVD-2026-195668

fkie_cve-2023-41890

Sustainsys.Saml2 library adds SAML2P support to ASP.NET web sites, allowing the web site to act as a SAML2 Service Provider. Prior to versions 1.0.3 and 2.9.2, when a response is processed, the issuer of the Identity Provider is not sufficiently validated. This could allow a malicious identity provider to craft a Saml2 response that is processed as if issued by another identity provider. It is also possible for a malicious end user to cause stored state intended for one identity provider to be used when processing the response from another provider. An application is impacted if they rely on any of these features in their authentication/authorization logic: the issuer of the generated identity and claims; or items in the stored request state (AuthenticationProperties). This issue is patched in versions 2.9.2 and 1.0.3. The `AcsCommandResultCreated` notification can be used to add the validation required if an upgrade to patched packages is not possible.

GHSA-fv2h-753j-9g39 — Sustainsys.Saml2 Insufficient Identity Provider Issuer Validation

Affected: NuGet: Sustainsys.Saml2, NuGet: Kentor.AuthServices

### Impact When a response is processed, the issuer of the Identity Provider is not sufficiently validated. This could allow a malicious identity provider to craft a Saml2 response that is processed as if issued by another identity provider. It is also possible for a malicious end user to cause stored state intended for one identity provider to be used when processing the response from another provider.

An application is impacted if they rely on any of these features in their authentication/authorization logic: * the issuer of the generated identity and claims * items in the stored request state (AuthenticationProperties)

### Patches Patched in version 2.9.2 and 1.0.3. All previous versions are vulnerable.

### Workarounds The `AcsCommandResultCreated` notification can be used to add the validation required if an upgrade to patched packages is not possible.

### References The patch is linked to https://github.com/Sustainsys/Saml2/issues/712 and https://github.com/Sustainsys/Saml2/issues/713

gsd-2023-41890

jvndb-2023-000112

Pleasanter provided by Implem Inc. contains multiple vulnerabilities listed below. <ul><li>Stored cross-site scripting vulnerability (CWE-79) - CVE-2023-34439</li><li>Improper access control vulnerability (CWE-284) - CVE-2023-45210</li><li>Open redirect vulnerability (CWE-601) - CVE-2023-46688</li><li>Authentication bypass vulnerability by SAML (CWE-289) - CVE-2023-41890</li></ul> CVE-2023-41890 This issue is caused by a vulnerability in Sustainsys.Saml2 library used in the product. CVE-2023-34439,CVE-2023-45210 Sato Nobuhiro of Suzuki Motor Corporation and You Okuma of LAC Co., Ltd. reported these vulnerabilities to IPA. JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership. CVE-2023-46688 Yoichi Tsuzuki of FFRI Security, Inc. reported this vulnerability to IPA. JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership. Implem Inc. reported to IPA that CVE-2023-41890 vulnerability still exists in the product. JPCERT/CC coordinated with the developer.