CVE-2026-5429

Kiro IDE Webview Cross-Site Scripting via Workspace Color Theme

State: Published
Severity: 7.1 High
Published: Apr 2, 2026
Updated: Apr 2, 2026
Reserved: Apr 2, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:L/AC:L/AT:P/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-79 Improper neutralization of input during web page generation ('cross-site scripting')

Affected Products

Product	Versions
Kiro IDEAWS	0.1 to before 0.8.140Affected

References

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

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