What is CVE-2026-5429?

CVE-2026-5429 is a high-severity vulnerability in Aws Kiro Ide, classified under Cross-site Scripting. CVSS score: 7.8/10. Published 2026-04-02.

How severe is CVE-2026-5429?

High severity. CVSS v3 base score is 7.8 out of 10.

XSS in Aws Kiro Ide

CVE-2026-5429

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 loc…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Aws Kiro Ide — versions 0.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

aws.amazon.com/security/security-bulletins/2026-012-aws/ (vendor-advisory)
kiro.dev/changelog/ide/0-8/ (release-notes)

Frequently asked questions

What is CVE-2026-5429?: CVE-2026-5429 is a high-severity vulnerability in Aws Kiro Ide, classified under Cross-site Scripting. CVSS score: 7.8/10. Published 2026-04-02.
How severe is CVE-2026-5429?: High severity. CVSS v3 base score is 7.8 out of 10.