Authenticated file read and write via path arguments
Published Jun 1, 2026 · Updated Jun 1, 2026
Path traversal in ishayoyo Excel MCP Server 1.0.0 through 1.0.2 allows remote authenticated users to read or write local spreadsheet files. The read_file and write_file flows resolve caller-controlled path arguments and pass them to filesystem APIs without a workspace boundary or allowlist. Exploitation requires access to invoke an affected MCP tool, and access remains limited to supported files readable or writable by the server process.
Summary
What happened
Path traversal in ishayoyo Excel MCP Server 1.0.0 through 1.0.2 allows remote authenticated users to read or write local spreadsheet files. The read_file and write_file flows resolve caller-controlled path arguments and pass them to filesystem APIs without a workspace boundary or allowlist. Exploitation requires access to invoke an affected MCP tool, and access remains limited to supported files readable or writable by the server process.
The record
- CVE
- CVE-2026-10278
- Published
- Jun 1, 2026
- Updated
- Jun 1, 2026
- Vendor
- Haris Musa
- Product
- Excel MCP Server
- Classifications
- CWE-73, T1005, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 1, 2026CVE publishedPublication date reported by the CVE source.
- Jun 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.0
- Affected versionversion=1.0.1
- Affected versionversion=1.0.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- MCP read and write JSON-RPC reproductionfunctional · demonstrated
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Technologies
Your stack
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Your stack
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