MongoDB Mongoid up to 8.0.12/8.1.12/9.0.11/9.1.0 Document Persistence Layer externally-controlled input to select classes or code

Summaryinfo

A vulnerability, which was classified as critical, has been found in MongoDB Mongoid up to 8.0.12/8.1.12/9.0.11/9.1.0. This issue affects some unknown processing of the component Document Persistence Layer. This manipulation causes use of externally-controlled input to select classes or code. This vulnerability appears as CVE-2026-93765. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in MongoDB Mongoid up to 8.0.12/8.1.12/9.0.11/9.1.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Document Persistence Layer. The manipulation with an unknown input leads to a use of externally-controlled input to select classes or code vulnerability. The CWE definition for the vulnerability is CWE-470. The product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code. As an impact it is known to affect integrity, and availability. The summary by CVE is:

Mongoid contains an unsafe reflection weakness in the document persistence layer of its object-document mapping code. Input whose keys are passed through from an unauthenticated party by an embedding application can cause unintended internal method invocation instead of the intended array field update. This may result in unintended removal of stored records and in the embedding application becoming unresponsive.

The advisory is shared at jira.mongodb.org. This vulnerability is known as CVE-2026-93765 since 09/18/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/18/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Database Software

Vendor

• MongoDB

Name

• Mongoid

Version

• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5
• 8.0.6
• 8.0.7
• 8.0.8
• 8.0.9
• 8.0.10
• 8.0.11
• 8.0.12
• 8.1.0
• 8.1.1
• 8.1.2
• 8.1.3
• 8.1.4
• 8.1.5
• 8.1.6
• 8.1.7
• 8.1.8
• 8.1.9
• 8.1.10
• 8.1.11
• 8.1.12
• 9.0
• 9.0.0
• 9.0.1
• 9.0.2
• 9.0.3
• 9.0.4
• 9.0.5
• 9.0.6
• 9.0.7
• 9.0.8
• 9.0.9
• 9.0.10
• 9.0.11
• 9.1.0

License

• open-source

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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