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TI-2026-81037 Aliases CVE-2026-18451GHSA-3989-gjgc-5cm8

Predictable KVM session token in Supermicro BMC iKVM enables hijacking

Priority LOW 14CWE-337Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Supermicro BMC firmware for the MBD-X12SPI board, from 01.07.20, has a weak launch token for its iKVM feature. The HTML5 KVM-over-IP console authenticates with a token generated from a predictable time-based seed (CWE-337). An attacker who can guess the session token may take control of the KVM session, and the CVSS vector indicates the attack is network-based, needs high complexity, and requires user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00151 4th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SMCIMBD-X12SPI01.07.20 and later—No fix listedCNA
  • MBD-X12SPI VendorSMCI Affected 01.07.20 and later Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Supermicro BMC iKVM on MBD-X12SPI.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-18451
  2. 2026-10-27 Alias added: GHSA-3989-gjgc-5cm8
  3. 2026-11-04 CISA SSVC decision points changed

References

Other 1

  • TI-2026-81036 Supermicro BMC accepts unprotected IPMI commands on active sessions CVSS 3.1CRITICAL 9.8
  • TI-2026-03310 Supermicro SMASH service contain an Arbitrary code execution issue CVSS 3.1HIGH 8.8
  • TI-2026-81040 Privilege escalation in Supermicro BMC IPMI allows admin access CVSS 3.1HIGH 8.8
  • TI-2026-81034 Fixed key flaw in Supermicro BMC lets attackers run IPMI commands CVSS 3.1HIGH 7.5
  • TI-2025-11009 Supermicro BMC firmware update validation bypass CVSS 3.1HIGH 8.4
  • TI-2026-81038 Supermicro BMC grants IPMI session on out-of-order RAKP message 3 CVSS 3.1HIGH 7.4
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences