Is CVE-2026-45539 actively exploited?

No active exploitation of CVE-2026-45539 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45539 be exploited remotely?

Yes. CVE-2026-45539 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45539?

CVE-2026-45539 has a CVSS score of 7.4 (HIGH).

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HIGH

CVE-2026-45539

CWE-59Published: May 15, 2026· Updated: May 18, 2026

7.4

CVSS v3.1

EPSS:0.08%probability of exploitation in 30 daysPercentile:22.5th

Official Description

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.read_text(), transparently following symbolic links. A symlink committed inside a remote APM dependency under .apm/prompts/<x>.prompt.md or .apm/agents/<x>.agent.md is preserved verbatim into apm_modules/ on clone and then dereferenced during integration, with the resolved content written as a regular file into the project's deploy directories. The package content_hash, the pre-deploy SecurityGate scan, and apm audit do not flag this. The deploy roots are not added to the auto-generated .gitignore, so the resulting files are staged by git add by default. This vulnerability is fixed in 0.13.0.

NVD Source

Technical Analysis

CVE-2026-45539 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.4.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.