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Response snapshot Oct 27, 2026, 05:12 UTC

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Vulnerabilitythehackernews-opencode-flaw-lets-malicious-mcp-3c95c0f04e66

OpenCode Flaw Lets Malicious MCP Servers Execute Code During Sign-In on Windows and WSL

A flaw in the OpenCode AI coding agent allowed a malicious or hijacked MCP server to run code on a developer's Windows or WSL machine when the developer signed in.

At a glance

Exploited
Not known
Severity
Not scored yet
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory linked from the article for affected versions and fixes.

Read The Hacker News: OpenCode Flaw Lets Malicious MCP Servers Execute Code During Sign-In on Windows and WSL (opens a new tab)

What happened

A flaw in the OpenCode AI coding agent allowed a malicious or hijacked MCP server to run code on a developer's Windows or WSL machine when the developer signed in. OpenCode connects to MCP (Model Context Protocol) servers to add outside tools, and such code would run with the developer's own access.

Anomaly, the company behind OpenCode, fixed the flaw in version 1.18.33 on September

Sources

  1. Reporting

    The Hacker News: OpenCode Flaw Lets Malicious MCP Servers Execute Code During Sign-In on Windows and WSL (opens a new tab)

    The article reports this vulnerability. It is reporting, not independently primary-confirmed or locally reviewed.

    Published Checked

  2. Reporting

    The Hacker News syndication feed (opens a new tab)

    The RSS/Atom/RDF entry supplied this exact link and any available title, date, and excerpt.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 22). OpenCode Flaw Lets Malicious MCP Servers Execute Code During Sign-In on Windows and WSL. https://kevwire.com/record/thehackernews-opencode-flaw-lets-malicious-mcp-3c95c0f04e66

MLA

"OpenCode Flaw Lets Malicious MCP Servers Execute Code During Sign-In on Windows and WSL." KEVWire, 22 Oct. 2026, kevwire.com/record/thehackernews-opencode-flaw-lets-malicious-mcp-3c95c0f04e66.

Chicago

KEVWire. "OpenCode Flaw Lets Malicious MCP Servers Execute Code During Sign-In on Windows and WSL." Last modified October 22, 2026. https://kevwire.com/record/thehackernews-opencode-flaw-lets-malicious-mcp-3c95c0f04e66.

Evidence summary (plain text)

OpenCode Flaw Lets Malicious MCP Servers Execute Code During Sign-In on Windows and WSL (Oct 22, 2026).
A flaw in the OpenCode AI coding agent allowed a malicious or hijacked MCP server to run code on a developer's Windows or WSL machine when the developer signed in. OpenCode connects to MCP (Model Context Protocol) servers to add outside tools, and such code would run with the developer's own access.

Anomaly, the company behind OpenCode, fixed the flaw in version 1.18.33 on September
Sources:
The Hacker News: OpenCode Flaw Lets Malicious MCP Servers Execute Code During Sign-In on Windows and WSL: https://thehackernews.com/2026/10/opencode-flaw-lets-malicious-mcp.html
The Hacker News syndication feed: https://feeds.feedburner.com/TheHackersNews
Record ID: thehackernews-opencode-flaw-lets-malicious-mcp-3c95c0f04e66.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 05:10 UTC. Ingestion is not an independent editorial investigation.

Syndicated reporting, unreviewed by KEVWire and not independently primary-confirmed. Consult the exact article and any primary disclosure it links.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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