CVE-2023-41890

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
45.1%
KEV
Not listed

Published

September 19, 2023

Last Modified

June 17, 2026

References (6)

Affected Packages

(2 across 1 ecosystem)
NuGet(2)
PackageVulnerable rangeFixed inDependents
Kentor.AuthServices0.1.0 ... 0.9.0 (32 versions)——
Sustainsys.Saml22.0.0 ... 2.9.1 (11 versions)2.9.2—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

  1. 2026-07-22 14:06 UTCEPSS rescore
  2. 2026-07-21 15:23 UTCEPSS rescore
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  1. 2026-07-06 16:26 UTCEPSS rescore
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  48. 2026-06-09 20:17 UTCOSV refresh
  49. 2026-06-08 14:16 UTCEPSS rescore
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  51. 2026-06-07 15:23 UTCEPSS rescore
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  74. 2026-05-27 13:39 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-41890?
CVE-2023-41890 is a high vulnerability published on September 19, 2023. 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…
When was CVE-2023-41890 disclosed?
CVE-2023-41890 was first published in the National Vulnerability Database on September 19, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-41890 actively exploited?
CVE-2023-41890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-41890?
CVE-2023-41890 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-41890?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-41890, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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