CVE-2026-18830

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductAmazon Bedrock AgentCore harness

PublishedAug 4, 2026

First seenAug 4, 2026

Weakness typeCWE-1287CWE-1287

How to fix

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-073-aws/

Affected products

Product	Affected versions	Fixed in
AWS Amazon Bedrock AgentCore harness	No range specified	—

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