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CVE-2026-45539— Microsoft APM: Symlinks under `.apm/prompts/` and `.apm/agents/` are dereferenced during `apm install`, copying host-local file contents into the project tree

Quick assessment

Affected
microsoft apm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

APM – Agent Package Manager是Microsoft开源的一款AI代理依赖管理工具。 APM – Agent Package Manager 0.5.4版本至0.12.4版本存在后置链接漏洞，该漏洞源于Path.glob和Path.rglob调用跟随符号链接，导致远程依赖中的符号链接在集成时被解引用并写入部署目录。

CVSS 7.4 · High EPSS 1.06% · P63

Possible ATT&CK Techniques 1 AI

T1030 · Data Transfer Size Limits

Affected Version Matrix 1

VendorProduct Version RangeStatus
microsoft apm >= 0.5.4, < 0.13.0 affected
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I. Basic Information for CVE-2026-45539

Vulnerability Information
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Vulnerability Title
Microsoft APM: Symlinks under `.apm/prompts/` and `.apm/agents/` are dereferenced during `apm install`, copying host-local file contents into the project tree
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
APM – Agent Package Manager 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
APM – Agent Package Manager是Microsoft开源的一款AI代理依赖管理工具。 APM – Agent Package Manager 0.5.4版本至0.12.4版本存在后置链接漏洞，该漏洞源于Path.glob和Path.rglob调用跟随符号链接，导致远程依赖中的符号链接在集成时被解引用并写入部署目录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
microsoft apm >= 0.5.4, < 0.13.0 -

II. Public POCs for CVE-2026-45539

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III. Intelligence Information for CVE-2026-45539

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Vendor Advisories for CVE-2026-45539 (1)

Same Patch Batch · microsoft · 2026-05-15 · 3 CVEs total

CVE-2026-44641 7.1 HIGH Microsoft APM: plugin.json component paths escape plugin root and copy arbitrary host file
CVE-2026-46383 5.5 MEDIUM Microsoft APM: Windows absolute-path tar member overwrite during legacy-bundle probing in

IV. Related Vulnerabilities

Same product: apm
Same vendor: microsoft
Same weakness: CWE-59

V. Comments for CVE-2026-45539

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