CVE-2026-85661
⛔ criticalSummary
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.
CVSS Score
9.8
Critical
EPSS Score
0.4
Exploit Probability
Published Date
2026-09-04
First Seen: 2026-09-05
📊 Relative Risk Intelligence
This CVE is Very High Risk - more severe than 90.5% of all 353,061 vulnerabilities in our database.
#33,625
Top 10% most severe
Severity Percentile
Last Modified
2026-09-04
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Vector 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE IDs (Weakness Types)