Improper Neutralization of Special Elements in Data Query Logic in Flowise - CVE-2026-91937
Published: September 1, 2026 / Updated: September 16, 2026
Vulnerability identifier: #VU146554
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-91937
CWE-ID: CWE-943
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper neutralization of special elements used in a NoSQL command in MongoDBMemory node when handling Prediction API requests with a crafted overrideConfig.sessionId value. A remote attacker can send a specially crafted request containing a MongoDB operator object to disclose sensitive information.
The issue can expose chat history records from arbitrary other users in a shared MongoDB collection, including sensitive data disclosed to the AI agent. Public chatflows can be reached without authentication through the prediction endpoint.
Affected software
Flowise
How to mitigate CVE-2026-91937
Install security update from vendor's website.
Flowise - update to 3.1.4