Vulnerability details

CVE-2026-5429

AWS Kiro IDE

Kiro IDE Webview Cross-Site Scripting via Workspace Color Theme

CVSS 4.0

7.1High

Official 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 scores

Score	Version	Source	Vector
7.1High	4.0	CVEProject cvelistV5 (CNA) (AMZN)	`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`
7.8High	3.1	CVEProject cvelistV5 (CNA) (AMZN)	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
AWS	Kiro IDE	0.1 ≤ v < 0.8.140	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-04-02
Last updated: 2026-04-02
State: Published
Assigner (CNA): AMZN

Exploit prediction (EPSS)

0.16%

Probability of exploitation in 30 days

5.6%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-79
Improper neutralization of input during web page generation ('cross-site scripting')