CVE-2026-93758

Cross-principal document update, theft, and deletion via unvalidated id in nested attributes

HIGH
8.1
CVSS Score
Published: September 18, 2026 at 04:56 PM UTC
Updated: September 25, 2026 at 02:27 PM UTC
1 product affected across 1 vendorMongoid

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Severity
HIGH8.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

An insecure direct object reference in the nested attributes handling of the Mongoid object-document mapper may allow a user with basic application privileges to reference a record identifier that is not their own. Processing such a request can cause that record to be looked up without the usual ownership or scoping restrictions, then updated and linked to the requesting user's own record. This may result in unintended disclosure and unauthorized modification of data belonging to other users of the application.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

8.0.0 ≤ v ≤ 8.0.128.0.0 ≤ v < 8.0.128.1.0 ≤ v ≤ 8.1.128.1.0 ≤ v < 8.1.139.0.0 ≤ v ≤ 9.0.119.0.0 ≤ v < 9.0.128.0.08.1.09.0.09.1.0
Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.1.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.12, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

Vendor Advisory
Source: cverecord
https://jira.mongodb.org/browse/MONGOID-5992

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHmongodb
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-639

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