CVE-2026-26133

HIGHNVD 7.17.1—

7.1

AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CVSS v3: 7.1
EG Score: 7.1(medium)
EPSS: 17.2%
KEV: Not listed

Published

March 16, 2026

Last Modified

April 9, 2026

References (1)

secure@microsofthttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26133

Vendor Advisories for CVE-2026-26133(1)

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

CVE-2026-26133
Microsoft Security Response Center (MSRC)High
M365 Copilot Information Disclosure Vulnerability

Data Freshness Timeline

(refreshed 17× 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.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 16:59 UTCepss_batch
2026-05-23 15:21 UTCepss_batch
2026-05-22 21:16 UTCepss_batch

Frequently asked(5)

What is CVE-2026-26133?

CVE-2026-26133 is a high vulnerability published on March 16, 2026. AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.

When was CVE-2026-26133 disclosed?

CVE-2026-26133 was first published in the National Vulnerability Database on March 16, 2026, with the most recent update on April 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-26133 actively exploited?

CVE-2026-26133 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-26133?

CVE-2026-26133 has a CVSS v3 base score of 7.1 (NVD).

How do I remediate CVE-2026-26133?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26133, 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-2026-26133

Explore →

Is Your Infrastructure Affected by CVE-2026-26133?

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

Start Free Scan →Browse All CVEs

CVE-2026-26133

📅 Published

🔄 Last Modified

🔗 References (1)

📣 Vendor Advisories for CVE-2026-26133(1)

Data Freshness Timeline

❓ Frequently asked(5)