VULNERABILITY INTELLIGENCE

CVE-2026-4270

CVSS score5.5 MEDIUM
EPSS probability0.13%
CISA KEVNot currently listed
Published2026-03-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Description

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.

Weakness classification

  • ff89ba41-3aa1-4d27-914a-91399e9639e5: CWE-424

Primary references