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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

CVE-2026-4270: AWS API MCP Server file access restriction bypass

A flaw in the no-access and workdir features of the AWS API MCP Server (versions >= 0.2.14 and < 1.3.9) allowed intended file access restrictions to be bypassed, exposing arbitrary local file contents in the MCP client application context. AWS published a security bulletin and fixed the issue in version 1.3.9.

Disclosed 16 March 2026 · Record updated 13 September 2026

Impact

Bypass of intended file access restrictions could expose arbitrary local file contents to the MCP client application context.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-4270