CVE-2026-18954: CWE-863: Incorrect Authorization in AWS documentdb-mcp-server
Bulletin ID: 2026-076-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/05/2026 13:00 PM PDT Description: Amazon DocumentDB MCP Server is an open-source Model Context Protocol (MCP) server that enables AI assistants to interact with Amazon DocumentDB databases. We identified CVE-2026-18954, an incorrect authorization issue where write-capable aggregation pipeline stages ($out, $merge) bypass the read-only mode enforcement logic, potentially allowing an authenticated MCP client to perform write operations on the connected database. Impacted versions: < 1.0.12 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.
AI Analysis
Technical Summary
The vulnerability identified as CVE-2026-18954 affects AWS DocumentDB MCP Server prior to version 1.0.12. It involves incorrect authorization in the aggregation pipeline tool, where write-capable aggregation pipeline stages can bypass read-only mode enforcement. This allows an authenticated MCP client to execute inappropriate write operations on the database. AWS has addressed this issue in version 1.0.12, and users are advised to upgrade to this version or later to remediate the vulnerability.
Potential Impact
An authenticated MCP client can bypass read-only mode enforcement and perform unauthorized write operations on the connected database. This could lead to unauthorized data modification, impacting data integrity. There is no impact on confidentiality or availability reported. The CVSS v3.1 score is 5.5 (medium severity), reflecting limited attack vector (local), low complexity, and no user interaction required.
Mitigation Recommendations
A patch is available. Users should upgrade AWS DocumentDB MCP Server to version 1.0.12 or later to remediate this vulnerability. Since this is a cloud service, AWS manages remediation for the cloud-hosted service; however, customers running affected versions should ensure they upgrade accordingly. Refer to the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-076-aws/ for official guidance.
CVE-2026-18954: CWE-863: Incorrect Authorization in AWS documentdb-mcp-server
Description
Bulletin ID: 2026-076-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/05/2026 13:00 PM PDT Description: Amazon DocumentDB MCP Server is an open-source Model Context Protocol (MCP) server that enables AI assistants to interact with Amazon DocumentDB databases. We identified CVE-2026-18954, an incorrect authorization issue where write-capable aggregation pipeline stages ($out, $merge) bypass the read-only mode enforcement logic, potentially allowing an authenticated MCP client to perform write operations on the connected database. Impacted versions: < 1.0.12 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.
CVSS v3.1
Score 5.5medium
Affected software
AWS
documentdb-mcp-server
pkg:github/awslabs/documentdb-mcp-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-18954 affects AWS DocumentDB MCP Server prior to version 1.0.12. It involves incorrect authorization in the aggregation pipeline tool, where write-capable aggregation pipeline stages can bypass read-only mode enforcement. This allows an authenticated MCP client to execute inappropriate write operations on the database. AWS has addressed this issue in version 1.0.12, and users are advised to upgrade to this version or later to remediate the vulnerability.
Potential Impact
An authenticated MCP client can bypass read-only mode enforcement and perform unauthorized write operations on the connected database. This could lead to unauthorized data modification, impacting data integrity. There is no impact on confidentiality or availability reported. The CVSS v3.1 score is 5.5 (medium severity), reflecting limited attack vector (local), low complexity, and no user interaction required.
Mitigation Recommendations
A patch is available. Users should upgrade AWS DocumentDB MCP Server to version 1.0.12 or later to remediate this vulnerability. Since this is a cloud service, AWS manages remediation for the cloud-hosted service; however, customers running affected versions should ensure they upgrade accordingly. Refer to the AWS security bulletin at https://aws.amazon.com/security/security-bulletins/2026-076-aws/ for official guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-08-05T13:45:00.654Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-076-aws/","vendor":"AWS"}]
Threat ID: 6a739c88bf8831d5396b2ffd
Added to database: 08/05/2026, 20:26:48 UTC
Last enriched: 08/13/2026, 17:31:23 UTC
Last updated: 09/18/2026, 22:01:32 UTC
Views: 106
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.