What is CVE-2026-45539?

CVE-2026-45539 is a high-severity vulnerability in Microsoft Apm, classified under Improper Link Resolution Before File Access. CVSS score: 7.4/10. Published 2026-05-15.

How severe is CVE-2026-45539?

High severity. CVSS v3 base score is 7.4 out of 10.

Information disclosure in Microsoft Apm

CVE-2026-45539

Microsoft APM is an open-source, community-driven dependency manager for AI agents. From 0.5.4 to 0.12.4, two primitive integrators in apm-cli enumerate package files with bare Path.glob() / Path.rglob() calls and read each match with Path…

EPSS: 0.001 (21.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.

Affected products

Microsoft Apm — versions >= 0.5.4, < 0.13.0

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access
CWE-200 — Information Disclosure

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-45539?: CVE-2026-45539 is a high-severity vulnerability in Microsoft Apm, classified under Improper Link Resolution Before File Access. CVSS score: 7.4/10. Published 2026-05-15.
How severe is CVE-2026-45539?: High severity. CVSS v3 base score is 7.4 out of 10.