CVE-2026-9255

Tool Execution Without Authorization via Piped Stdin in Kiro CLI

Published May 22, 2026 CVSS 4.0 · 8.4 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Amazon
Amazon kiro Cli
CPEs cpe:2.3:a:amazon:kiro_cli:*:*:*:*:*:*:*:*
Vendors & Products Amazon
Amazon kiro Cli
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Tool Execution Without Authorization via Piped Stdin in Kiro CLI
First Time appeared Aws
Aws kiro Cli
Weaknesses CWE-862
CPEs cpe:2.3:a:aws:kiro_cli:*:*:*:*:*:*:*:*
Vendors & Products Aws
Aws kiro Cli
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.4, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
May 23, 2026, 3:55 AM
Reserved
May 21, 2026, 8:55 PM
Status
Analyzed
Published
May 22, 2026, 5:16 PM
Modified
Jul 23, 2026, 4:10 PM