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CVE-2026-18830

Insufficient input validation in Amazon Bedrock AgentCore harness InvokeHarness API

HIGH
8.1
CVSS Score
Published: August 4, 2026 at 05:42 PM UTC
Updated: October 24, 2026 at 04:10 PM UTC
1 product affected across 1 vendorBedrock Agentcore

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Severity
HIGH8.1
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Bedrock Agentcore· AWSpypi
90%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://aws.amazon.com/security/security-bulletins/2026-073-aws/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHAMZN
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-1287

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