Arbitrary file modification via unchecked context paths
Published Apr 28, 2026 · Updated Apr 28, 2026
Path traversal in Execution System MCP Server 0.1.0 allows remote attackers to modify existing service-writable Markdown files. The add_action tool passes its free-form context value to _get_context_file_path, which joins it beneath the contexts directory without normalization or a containment check before opening the resulting path for reading and writing. Exploitation requires MCP tool access and an existing Markdown target writable by the service account; successful requests alter data outside the configured repository subtree.
Summary
What happened
Path traversal in Execution System MCP Server 0.1.0 allows remote attackers to modify existing service-writable Markdown files. The add_action tool passes its free-form context value to _get_context_file_path, which joins it beneath the contexts directory without normalization or a containment check before opening the resulting path for reading and writing. Exploitation requires MCP tool access and an existing Markdown target writable by the service account; successful requests alter data outside the configured repository subtree.
The record
- CVE
- CVE-2026-7319
- Published
- Apr 28, 2026
- Updated
- Apr 28, 2026
- Vendor
- Brian Elinsky
- Product
- Execution System MCP Server
- Classifications
- CWE-22, T1565.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 28, 2026CVE publishedPublication date reported by the CVE source.
- Apr 28, 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?
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- Affected versionversion=0.1.0
What conditions does exploitation require?
What is affected?
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
- GitHub issue proof-of-concept MCP requestproof of concept · unverified
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Technologies
Your stack
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Your stack
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