CVE-2026-5631Public exploitNetwork attack vector

Unauthenticated code execution via unvalidated MCP commands

Published Apr 6, 2026 · Updated Apr 6, 2026

Code injection in GPT Researcher 3.4.0 through 3.4.3 allows remote attackers to execute commands through the unauthenticated /ws endpoint. extract_command_data accepts client-supplied MCP command, argument, and environment fields that flow without validation to anyio.open_process. Any network client that can reach the WebSocket service can run a process with the GPT Researcher server account's privileges.

CVSS severity7.3
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in GPT Researcher 3.4.0 through 3.4.3 allows remote attackers to execute commands through the unauthenticated /ws endpoint. extract_command_data accepts client-supplied MCP command, argument, and environment fields that flow without validation to anyio.open_process. Any network client that can reach the WebSocket service can run a process with the GPT Researcher server account's privileges.

The record

CVE
CVE-2026-5631
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Assaf Elovic
Product
GPT Researcher
Classifications
CWE-74, CWE-94, T1059.004, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.4.0
  2. Affected versionversion=3.4.1
  3. Affected versionversion=3.4.2
  4. Affected versionversion=3.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Assaf Elovic · GPT Researcherversion=3.4.0; version=3.4.1; version=3.4.2; version=3.4.3

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.004Unix Shell
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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