# CVE-2026-18830

## Summary

- **CVE ID:** CVE-2026-18830
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-1287
- **Published:** Aug 4, 2026
- **Last Modified:** Aug 4, 2026

## Description

Insufficient input validation in Amazon Bedrock AgentCore harness might allow an authenticated remote user to execute configured tools bypassing model invocation and security controls via crafted content blocks in conversation messages. AWS has addressed this issue. No customer action is required.

## Affected Products

- AWS — Amazon Bedrock AgentCore harness (N/A)

## References

- [CNA](https://aws.amazon.com/security/security-bulletins/2026-073-aws/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.53%
- **EPSS Percentile:** 43.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._