CVE-2026-9255

High

Description

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.

SeverityHigh

CVSS7.8

Exploit probability—

ProductAmazon Kiro Cli

PublishedMay 22, 2026

First seenMay 22, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

amazon kiro_cli1.28.0 or later

Vendor advisories

kiro.dev/changelog/cli/1-28/
aws.amazon.com/security/security-bulletins/2026-035-aws/

Affected products

Product	Affected versions	Fixed in
amazon kiro_cli	v < 1.28.0	1.28.0

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