CVE-2026-18830

Insufficient input validation in Amazon Bedrock AgentCore harness InvokeHarness API

Published Aug 4, 2026 CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Insufficient input validation in Amazon Bedrock AgentCore harness InvokeHarness API
First Time appeared Aws
Aws amazon Bedrock Agentcore Harness
Weaknesses CWE-1287
CPEs cpe:2.3:a:aws:amazon_bedrock_agentcore_harness:n_a:*:*:*:*:*:*:*
Vendors & Products Aws
Aws amazon Bedrock Agentcore Harness
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 8.6, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Oct 11, 2026, 8:09 PM
Reserved
Aug 4, 2026, 2:11 PM
Status
Awaiting Analysis
Published
Aug 4, 2026, 6:16 PM
Modified
Oct 24, 2026, 4:10 PM