CVE-2026-57860Public exploit

Code execution via untrusted MCP server commands

Published Jul 17, 2026 · Updated Jul 17, 2026

Command execution in Tailcall ForgeCode 2.11.1 allows attackers to run code when a local user starts it in an untrusted repository. At startup, the project-local .mcp.json loader passes each mcpServers command and args directly to a child process without a trust prompt. Execution requires a local user to start ForgeCode inside an attacker-controlled repository, after which the command runs with that user's privileges and can read, alter, or destroy accessible data.

CVSS severity8.4
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command execution in Tailcall ForgeCode 2.11.1 allows attackers to run code when a local user starts it in an untrusted repository. At startup, the project-local .mcp.json loader passes each mcpServers command and args directly to a child process without a trust prompt. Execution requires a local user to start ForgeCode inside an attacker-controlled repository, after which the command runs with that user's privileges and can read, alter, or destroy accessible data.

The record

CVE
CVE-2026-57860
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Tailcall, Inc.
Product
ForgeCode
Classifications
CWE-829, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 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=2.11.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Tailcall, Inc. · ForgeCodeversion=2.11.1

Published CVSS scores

7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.4VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-829Inclusion of Functionality from Untrusted Control Sphere
T1204.002User Execution: Malicious File

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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