CVE-2026-91937Network attack vectorHinoki check available

Chat history disclosure via sessionId NoSQL injection

Published Sep 15, 2026 · Updated Sep 15, 2026

NoSQL injection in Flowise before 3.1.4 allows remote attackers to read other users' chat histories through the prediction API. The MongoDBMemory node passes overrideConfig.sessionId into a MongoDB query without first requiring a string, so operator objects alter the query. Exploitation requires an exposed unauthenticated prediction endpoint, a flow using MongoDBMemory, and chat records in the shared collection.

CVSS severityUnavailable
Unscored
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NoSQL injection in Flowise before 3.1.4 allows remote attackers to read other users' chat histories through the prediction API. The MongoDBMemory node passes overrideConfig.sessionId into a MongoDB query without first requiring a string, so operator objects alter the query. Exploitation requires an exposed unauthenticated prediction endpoint, a flow using MongoDBMemory, and chat records in the shared collection.

The record

CVE
CVE-2026-91937
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FlowiseAI · Flowiseversion=0 <3.1.4

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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