Improperly Controlled Modification of Dynamically-Determined Object Attributes in Flowise - CVE-2026-69258
Published: July 30, 2026
Vulnerability identifier: #VU140081
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69258
CWE-ID: CWE-915
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to inject arbitrary properties into the flow execution context.
The vulnerability exists due to improperly controlled modification of dynamically-determined object attributes in the prediction API overrideConfig handling when processing unauthenticated POST requests to /api/v1/prediction/:id. A remote attacker can send a specially crafted request with an overrideConfig object to inject arbitrary properties into the flow execution context.
Injected properties may overwrite chatId, sessionId, or chatHistory values and may be resolved through $flow.* template variables in public chatflows.
Affected software
Flowise
How to mitigate CVE-2026-69258
Install security update from vendor's website.
Flowise - update to 3.1.3