Vulnerability record · CVE-2026-18830 · published 4 August 2026

CVE-2026-18830: Insufficient input validation in Amazon Bedrock AgentCore harness might allow an authenticated remote user to …

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.

8.6 CVSS 4.0 High EPSS 0.51% · top 59.2% CWE-1287 · CWE-1287 Awaiting Analysis

8.6CVSS 4.0 base score

0.51%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

1References

6 Aug 2026Last modified by NVD

Description

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

Link	Tags
https://aws.amazon.com/security/security-bulletins/2026-073-aws/

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-18830), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.