CVE-2026-5429

HIGH 7.8

Kiro IDE Webview Cross-Site Scripting via Workspace Color Theme

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	aws
Product	kiro ide
Published	Apr 2, 2026
Last Updated	Apr 2, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

AWS / Kiro IDE

0.1 < 0.8.140

References

NVD ↗ CVE.org ↗ EPSS Data ↗

aws.amazon.com: https://aws.amazon.com/security/security-bulletins/2026-012-aws/ kiro.dev: https://kiro.dev/changelog/ide/0-8/#patch-0-8-140