CVE-2026-4270 — AWS API MCP File Access Restriction Bypass
Improper Protection of Alternate Path exists in the no-access and workdir feature of the AWS API MCP Server versions >= 0.2.14 and < 1.3.9 on all platforms may allow the bypass …
Published: 2026-03-16 · CVSS: 6.8 · CVSS 4.0
Improper Protection of Alternate Path exists in the no-access and workdir feature of the AWS API MCP Server versions >= 0.2.14 and < 1.3.9 on all platforms may allow the bypass of intended file access restriction and expose arbitrary local file contents in the MCP client application context. To remediate this issue, users should upgrade to version 1.3.9.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7