CVE-2026-54130

Name: CVE-2026-54130
Creator: NVD / NIST
Published: 2026-06-18T22:16:32.223+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.58%

Last modified Jun 25, 2026

CVE-2026-54130 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.58%

43.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Microsoft	365 Copilot	All versions

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130Vendor Advisory

Timeline

Published: Jun 18, 2026
Last Modified: Jun 25, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-54130?

Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

How severe is CVE-2026-54130?

CVE-2026-54130 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2026-54130?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-54130?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST