CVE-2026-5429

Kiro IDE Webview Cross-Site Scripting via Workspace Color Theme

CVSS 7.1 HIGHEPSS 0.2%CWE-79

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.1EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

02 Apr 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected products

AWS · Kiro IDE

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References

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