CVE-2026-42901

CRITICALPre-NVD 10.010.0—Trending — 4 sources updated this week

10.0

Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.

CVSS v3: 10.0
EG Score: 10.0(high)
EPSS: 13.6%
KEV: Not listed

Published

May 22, 2026

Last Modified

June 2, 2026

Advisory Details (1)

Auto-updated May 29, 2026

Patch available. Sources: microsoft.

microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42901

Vendor Advisories for CVE-2026-42901(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

CWE-346Origin Validation Error

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 04:37 UTCEG score recompute
2026-06-04 04:37 UTCVendor advisory
2026-06-04 04:37 UTCGHSA enrichment
2026-06-04 00:30 UTCEG score recompute
2026-06-04 00:30 UTCVendor advisory
2026-06-04 00:30 UTCGHSA enrichment
2026-06-03 20:23 UTCEG score recompute
2026-06-03 20:23 UTCVendor advisory
2026-06-03 20:23 UTCGHSA enrichment
2026-06-03 16:16 UTCEG score recompute
2026-06-03 16:16 UTCVendor advisory
2026-06-03 16:16 UTCGHSA enrichment
2026-06-03 12:09 UTCEG score recompute
2026-06-03 12:09 UTCVendor advisory
2026-06-03 12:09 UTCGHSA enrichment
2026-06-03 08:02 UTCEG score recompute
2026-06-03 08:02 UTCVendor advisory
2026-06-03 08:01 UTCGHSA enrichment
2026-06-03 03:54 UTCEG score recompute
2026-06-03 03:54 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-42901?

CVE-2026-42901 is a critical vulnerability published on May 22, 2026. Origin validation error in Microsoft Entra ID allows an unauthorized attacker to elevate privileges over a network.

When was CVE-2026-42901 disclosed?

CVE-2026-42901 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-42901 actively exploited?

CVE-2026-42901 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-42901?

CVE-2026-42901 has a CVSS v3 base score of 10.0 (NVD).

How do I remediate CVE-2026-42901?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42901, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-42901

Explore →

Is Your Infrastructure Affected by CVE-2026-42901?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2026-42901

Published

Last Modified

Advisory Details (1)

Security Update Guide - Microsoft Security Response Center

Vendor Advisories for CVE-2026-42901(2)

Weakness Classification(1)

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-42901?

Same vendor

Same CWE

CVE-2026-42901

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

Security Update Guide - Microsoft Security Response Center

📣 Vendor Advisories for CVE-2026-42901(2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-42901?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

Advisory Details (1)

Vendor Advisories for CVE-2026-42901(2)

Frequently asked(5)

Related CVEs(same vendor + same CWE)