CVE-2026-40933 | FlowiseAI Flowise up to 3.0.x /tmp/pwn os command injection

VDB-358753 · CVE-2026-40933 · GCVE-0-2026-40933 FLOWISEAI FLOWISE UP TO 3.0.X /TMP/PWN OS COMMAND INJECTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.9 $0-$5k 1.29+ Summaryinfo A vulnerability has been found in FlowiseAI Flowise up to 3.0.x and classified as critical. Affected is an unknown function of the file /tmp/pwn. This manipulation causes os command injection. This vulnerability appears as CVE-2026-40933. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded. Detailsinfo A vulnerability has been found in FlowiseAI Flowise up to 3.0.x and classified as critical. Affected by this vulnerability is an unknown part of the file /tmp/pwn. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, due to unsafe serialization of stdio commands in the MCP adapter, an authenticated attacker can add an MCP stdio server with an arbitrary command, achieving command execution. The vulnerability lies in a bug in the input sanitization from the “Custom MCP” configuration in http://localhost:3000/canvas - where any user can add a new MCP, when doing so - adding a new MCP using stdio, the user can add any command, even though your code have input sanitization checks such as validateCommandInjection and validateArgsForLocalFileAccess, and a list of predefined specific safe commands - these commands, for example "npx" can be combined with code execution arguments ("-c touch /tmp/pwn") that enable direct code execution on the underlying OS. This vulnerability is fixed in 3.1.0. The advisory is shared at github.com. This vulnerability is known as CVE-2026-40933 since 04/15/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue. Upgrading to version 3.1.0 eliminates this vulnerability. Productinfo Vendor FlowiseAI Name Flowise Version 3.0 Website Product: https://github.com/FlowiseAI/Flowise/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 8.1 VulDB Meta Temp Score: 7.9 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 9.9 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Os command injection CWE: CWE-78 / CWE-77 / CWE-74 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Flowise 3.1.0 Timelineinfo 04/15/2026 CVE reserved 04/22/2026 +7 days Advisory disclosed 04/22/2026 +0 days VulDB entry created 04/22/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-40933 (🔒) GCVE (CVE): GCVE-0-2026-40933 GCVE (VulDB): GCVE-100-358753 Entryinfo Created: 04/22/2026 07:29 Changes: 04/22/2026 07:29 (64) Complete: 🔍 Cache ID: 99:D98:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸