9.1

CVE-2026-93765: mongodb inc. mongoid Unsafe Reflection

CVSS: 9.1v3.1CriticalAnalyzed
Published 18-09-2026Last modified 21-09-2026
Open JSON

Vulnerability summary

CVE-2026-93765 is a critical (CVSS 9.1) Unsafe Reflection vulnerability in mongodb inc. mongoid. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 42.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.51%
0%100%
Low · +0.22 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-09-2026
    PublishedVulnerability first disclosed.
  2. 21-09-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

+0.22 pp

From 0.29% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.51%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mongodb1 product
  • mongoid≥ 8.0.0, < 8.0.12 | ≥ 8.1.0, < 8.1.13 | ≥ 9.0.0, < 9.0.12 | 9.1.0
Mongodb inc.1 product
  • mongoid9.1.0 | ≥ 9.0.0, ≤ 9.0.11 | ≥ 8.1.0, ≤ 8.1.12 | ≥ 8.0.0, ≤ 8.0.12

2 vendors · 2 products

References

1 links