CVE-2026-9255: Amazon Kiro CLI

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Missing input source validation in the tool authorization prompt in Kiro CLI before 1.28.0 allows a local attacker to execute arbitrary tools, including shell commands, without user approval by crafting content that is piped to kiro-cli via stdin. We recommend you to upgrade to kiro-cli version 1.28.0 or later.

Affected products

• Amazon Kiro CLI: before 1.28.0 (fixed in 1.28.0)

Published 2026-05-22. Last modified 2026-07-23.