# CVE-2026-9255: Tool Execution Without Authorization via Piped Stdin in Kiro CLI

> CVE-2026-9255: Tool Execution Without Authorization via Piped Stdin in Kiro CLI. CVSS 7.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-9255
Last updated: 2026-07-23T16:10:00Z

- Published: 2026-05-22 16:38 UTC · Updated: 2026-07-23 16:10 UTC · Assigner: AMZN
- CVSS: 7.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 0.12%, 2th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-862

## 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.

## Affected vendors and products

- AWS: Kiro CLI

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-9255)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-9255)
- [https://aws.amazon.com/security/security-bulletins/2026-035-aws/](https://aws.amazon.com/security/security-bulletins/2026-035-aws/)
- [https://kiro.dev/changelog/cli/1-28/](https://kiro.dev/changelog/cli/1-28/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-9255 · Markdown: https://rewindex.com/cve/CVE-2026-9255.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-9255 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:15.766Z