CVE-2026-7191
Prototype Manipulation RCE in qnabot-on-aws Fulfillment Lambda
Publication date: 2026-04-27
Last updated on: 2026-04-27
Assigner: AMZN
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| static-eval | static-eval | to 7.2.4 (exc) |
| qnabot-on-aws | qnabot-on-aws | From 7.3.0 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-94 | The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. |
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability impact me? :
The vulnerability can have severe impacts as it may grant direct access to backend resources that are normally not exposed through administrative interfaces. These resources include Lambda environment variables, OpenSearch indices, S3 objects, and DynamoDB tables. Exploiting this vulnerability allows an attacker to execute arbitrary code, potentially leading to data breaches, unauthorized data manipulation, or disruption of services.
Can you explain this vulnerability to me?
This vulnerability involves the improper use of the static-eval npm package in the open source solution qnabot-on-aws versions 7.2.4 and earlier. An authenticated administrator can exploit this by injecting a crafted conditional chaining expression through the Content Designer interface. This injection bypasses the intended expression sandbox using JavaScript prototype manipulation, allowing the attacker to execute arbitrary code within the fulfillment Lambda execution context.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, it is recommended to upgrade qnabot-on-aws to version 7.3.0 or above.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
This vulnerability allows an authenticated administrator to execute arbitrary code within the fulfillment Lambda execution context, potentially granting direct access to backend resources such as Lambda environment variables, OpenSearch indices, S3 objects, and DynamoDB tables that are not normally exposed.
Such unauthorized access to sensitive backend resources could lead to exposure or manipulation of personal or protected data, which may impact compliance with data protection standards and regulations like GDPR and HIPAA.
However, specific impacts on compliance depend on the nature of the data stored and how the affected system is used within an organization's environment.