Kiro IDE <0.8.140 Webview Unsanitized Input RCE
CVE-2026-5429 Published on April 2, 2026
Kiro IDE Webview Cross-Site Scripting via Workspace Color Theme
Unsanitized input during web page generation in the Kiro Agent webview in Kiro IDE before version 0.8.140 allows a remote unauthenticated threat actor to execute arbitrary code via a potentially damaging crafted color theme name when a local user opens the workspace. This issue requires the user to trust the workspace when prompted.
To remediate this issue, users should upgrade to version 0.8.140.
Vulnerability Analysis
CVE-2026-5429 can be exploited with local system access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-5429 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-5429
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Affected Versions
AWS Kiro IDE:- Version 0.1 and below 0.8.140 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.