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CVE Vulnerability Details :
CVE-2026-9255
PUBLISHED
More InfoOfficial Page
Assigner-AMZN
Assigner Org ID-ff89ba41-3aa1-4d27-914a-91399e9639e5
View Known Exploited Vulnerability (KEV) details
Published At-22 May, 2026 | 16:38
Updated At-23 May, 2026 | 03:55
Rejected At-
▼CVE Numbering Authority (CNA)
Tool Execution Without Authorization via Piped Stdin in Kiro CLI

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
Vendor
AWS
Product
Kiro CLI
Default Status
unaffected
Versions
Affected
  • From 0 before 1.28.0 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-862CWE-862: Missing Authorization
Type: CWE
CWE ID: CWE-862
Description: CWE-862: Missing Authorization
Metrics
VersionBase scoreBase severityVector
3.17.8HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.08.4HIGH
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
Version: 3.1
Base score: 7.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Version: 4.0
Base score: 8.4
Base severity: HIGH
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
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-233CAPEC-233: Privilege Escalation
CAPEC ID: CAPEC-233
Description: CAPEC-233: Privilege Escalation
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://kiro.dev/changelog/cli/1-28/
release-notes
https://aws.amazon.com/security/security-bulletins/2026-035-aws/
vendor-advisory
Hyperlink: https://kiro.dev/changelog/cli/1-28/
Resource:
release-notes
Hyperlink: https://aws.amazon.com/security/security-bulletins/2026-035-aws/
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found