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CVE-2026-5429

Kiro IDE Webview Cross-Site Scripting via Workspace Color Theme

Published: Apr 2, 2026Updated: Jul 24, 2026 Sources: CVE List NVDCWE-79
7.8HIGH
NVD MITRE
EPSS Score
0.2%
Top 94.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-79

Affected Products

AWS
commercial·US
Kiro IDESaaSDev Tool
Cloud & SaaS

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

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

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