High 7.8Published Apr 2, 2026

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

Updated under an hour ago (Oct 26, 2026, 2:00 PM ET)

Does this affect you?

It affects AWS Kiro IDE. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for AWS Kiro IDE

Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Apr 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

AWS Kiro IDE aws:kiro_ide (from the name)	from 0.1 before 0.8.140	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.