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CVE-2026-105811— Authorization bypass through a user-controlled key in the Amazon Q Business Lambda hook sample in QnABot on AWS

Quick assessment

Affected
aws qnabot-on-aws
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 QnABot on AWS 版本 7.0.0 至 7.4.5 中，可选的 Amazon Q Business Lambda Hook 示例代码（q-business-lambda-hook，详见 https://github.com/aws-solutions-library-samples/qnabot-on-aws/blob/main/source/docs/lambda_hooks/README.md）存在通过用户可控键绕过身份验证的漏洞。该漏洞可能允许经过认证的远程用户读取部署该解决方案的 AWS 账户

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-105811

Vulnerability Information
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Vulnerability Title
Authorization bypass through a user-controlled key in the Amazon Q Business Lambda hook sample in QnABot on AWS
Source: CVE Program / CVE List V5
Vulnerability Description
Authorization bypass through a user-controlled key in the optional Amazon Q Business Lambda hook sample ( q-business-lambda-hook https://github.com/aws-solutions-library-samples/qnabot-on-aws/blob/main/source/docs/lambda_hooks/README.md ), available with QnABot on AWS versions 7.0.0 through 7.4.5, might allow an authenticated remote user to read arbitrary Amazon S3 objects in the deploying AWS account. This sample solution provides an example Lambda hook and requires separate, manual deployment and additional setup. It is not deployed automatically with QnABot. Customers who have not deployed this optional sample hook are not affected and do not need to take action. To remediate this issue, affected customers should update the QnABot on AWS stack to version 7.4.6 or later and then redeploy the Amazon Q Business Lambda hook sample stack. Updating the QnABot on AWS stack alone does not deliver the fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
aws qnabot-on-aws 7.0.0 ~ 7.4.6 -

II. Public POCs for CVE-2026-105811

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III. Intelligence Information for CVE-2026-105811

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Other References for CVE-2026-105811 (2)

Same Patch Batch · aws · 2026-10-06 · 3 CVEs total

CVE-2026-105812 9.0 CRITICAL Code injection via unencoded configuration values during Python code generation in Bedrock
CVE-2026-106032 5.7 MEDIUM Server-side request forgery and local file read via unrestricted external OpenAPI referenc

IV. Related Vulnerabilities

Same vendor: aws
Same weakness: CWE-639

V. Comments for CVE-2026-105811

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