CVE-2026-20817

HIGHNVD 7.87.8—

7.8

Improper handling of insufficient permissions or privileges in Windows Error Reporting allows an authorized attacker to elevate privileges locally.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 27.8%
KEV: Not listed

Published

January 13, 2026

Last Modified

May 26, 2026

References (3)

secure@microsofthttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2026-20817-detection-script-eop-vulnerabilit-in-windows-error-reporting
af854a3a-2127-422b-91ae-364da2661108https://www.vicarius.io/vsociety/posts/cve-2026-20817-mitigation-script-eop-vulnerability-in-windows-error-reporting

Vendor Advisories for CVE-2026-20817(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-280

Data Freshness Timeline

(refreshed 15× 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.

2026-06-02 20:13 UTCepss_batch
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2026-06-01 13:51 UTCepss_batch
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2026-05-31 22:30 UTCepss_batch
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2026-05-29 13:44 UTCepss_batch
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2026-05-28 13:44 UTCepss_batch
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2026-05-27 13:40 UTCepss_batch
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2026-05-27 13:40 UTCepss_batch
2026-05-26 18:56 UTCEG score recompute
2026-05-26 18:56 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-20817?

CVE-2026-20817 is a high vulnerability published on January 13, 2026. Improper handling of insufficient permissions or privileges in Windows Error Reporting allows an authorized attacker to elevate privileges locally.

When was CVE-2026-20817 disclosed?

CVE-2026-20817 was first published in the National Vulnerability Database on January 13, 2026, with the most recent update on May 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-20817 actively exploited?

CVE-2026-20817 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-20817?

CVE-2026-20817 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2026-20817?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20817, 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

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CVE-2026-20817

📅 Published

🔄 Last Modified

🔗 References (3)

📣 Vendor Advisories for CVE-2026-20817(2)