Vulnerability in MongoDB Mongoid
CVE-2026-93765
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- MongoDB Mongoid — versions 9.1.0
- MongoDB Inc. Mongoid — versions 9.1.0
Weakness classification (CWE)
References
- jira.mongodb.org/browse/MONGOID-5973 (Permissions Required)
Frequently asked questions
- What is CVE-2026-93765?
- CVE-2026-93765 is a critical-severity vulnerability in MongoDB Mongoid, classified under Use of Externally-Controlled Input to Select Classes or Code (Unsafe Reflection). CVSS score: 9.1/10. Published 2026-09-18.
- How severe is CVE-2026-93765?
- Critical severity. CVSS v3 base score is 9.1 out of 10.