CVE-2026-5429 HIGH

CVE-2026-5429: Kiro IDE Webview Cross-Site Scripting via Workspace Color Theme

Vendor Aws
Product Kiro IDE
Weakness CWE-79 · XSS
Published April 2, 2026
Last update April 2, 2026
View on NVD All CVEs

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 2, 2026 CVE published
April 2, 2026 Record updated