CVE-2026-9255
Tool Execution Without Authorization via Piped Stdin in Kiro CLI
- State
- Published
- Severity
- 8.4 High
- Published
- May 22, 2026
- Updated
- May 23, 2026
- Reserved
- May 21, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.4 High | 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 | AMZN |
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | AMZN |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
Kiro CLIAWS |
|
References
- https://kiro.dev/changelog/cli/1-28/release-notes
- https://aws.amazon.com/security/security-bulletins/2026-035-aws/vendor-advisory
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