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CRITICAL

CVE-2026-85661

CVSS v3

9.8

CRITICAL

EPSS Score

0.7 %

exploit probability, as of 2026-09-29

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

excel-mcp-server 0.1.8 fails to enforce path confinement in stdio mode when EXCEL_FILES_PATH is unset, allowing attackers to read and write arbitrary files. Attackers can supply unchecked file paths to read and write tools to access any file accessible to the process.

Technical details

Published
2026-09-04
Last Modified
2026-09-04

Frequently asked questions

What is CVE-2026-85661?

excel-mcp-server 0.1.8 fails to enforce path confinement in stdio mode when EXCEL_FILES_PATH is unset, allowing attackers to read and write arbitrary files. Attackers can supply unchecked file paths to read and write tools to access any file accessible to the process.

Is CVE-2026-85661 actively exploited?

Active exploitation of CVE-2026-85661 has not been confirmed. Its EPSS score was 0.7% on 2026-09-29, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-85661?

CVE-2026-85661 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2026-85661 affecting your environment?

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