# CVE-2026-10591 — AWS Kiro IDE

> As of 2026-06-03, CVE-2026-10591 is a HIGH-severity vulnerability in AWS Kiro IDE, CVSS v3.1 8.8, EPSS 0.6% (51.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-10591, most recently “Prompt Injection in AWS Kiro Leads to Remote Code Execution via Unprotected MCP Config (mcp.json)”.

**Last updated:** 2026-06-03

## What is CVE-2026-10591?

Insufficient access control restrictions in the file write tool in Amazon Kiro IDE before version 0.11 might allow remote unauthenticated actors to execute arbitrary commands via crafted instructions that cause writes to execution-sensitive paths (such as .vscode/tasks.json), enabling auto-execution on folder open. To remediate this issue, users should upgrade to Kiro IDE version 0.11 or later.

The record classifies CVE-2026-10591 under weakness class [CWE-732](https://intel.threadlinqs.com/cwe/CWE-732). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 144 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.6% probability of exploitation in the next 30 days, higher than 51.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-02, last modified 2026-06-03

## Is CVE-2026-10591 being exploited?

It currently carries a trending score of 18 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [AWS](https://intel.threadlinqs.com/vendors/aws): Kiro IDE

## How to fix CVE-2026-10591

No vendor patch reference has been recorded for CVE-2026-10591 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-10591

1 tracked threat in the Threadlinqs corpus references CVE-2026-10591, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Prompt Injection in AWS Kiro Leads to Remote Code Execution via Unprotected MCP Config (mcp.json)](https://intel.threadlinqs.com/threat/TL-2026-1631) — HIGH · 2026-07-22

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [kiro.dev — release notes](https://kiro.dev/changelog/ide/0-11/)
- [aws.amazon.com — vendor advisory](https://aws.amazon.com/security/security-bulletins/2026-037-aws/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-10591
Full detection coverage and IOCs for threats exploiting CVE-2026-10591 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp