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Vulnerability record · CVE-2026-5429 · published 2 April 2026

CVE-2026-5429: Cross-site scripting vulnerability

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.

7.1 CVSS 4.0 High EPSS 0.23% · top 87.3% CWE-79 · Cross-site scripting Awaiting Analysis
7.1CVSS 4.0 base score
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
24 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-5429), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.