CVE-2026-8810

Credential disclosure via UEFI variable storage

Published Aug 19, 2026 · Updated Aug 20, 2026

Credential disclosure in Insyde Software InsydeH2O UEFI BIOS before 05.63.21 and 05.72.21 allows local users to read HDD passwords from UEFI variables. On ARM platforms, the HDD Password design leaves the password retrievable from firmware-managed UEFI variable storage instead of protecting it against local reads. Exploitation requires physical access, low privileges, and user interaction, and the disclosed disk password can then be reused to unlock protected storage.

CVSS severity6.9
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential disclosure in Insyde Software InsydeH2O UEFI BIOS before 05.63.21 and 05.72.21 allows local users to read HDD passwords from UEFI variables. On ARM platforms, the HDD Password design leaves the password retrievable from firmware-managed UEFI variable storage instead of protecting it against local reads. Exploitation requires physical access, low privileges, and user interaction, and the disclosed disk password can then be reused to unlock protected storage.

The record

CVE
CVE-2026-8810
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
Insyde Software
Product
InsydeH2O UEFI BIOS
Classifications
CWE-522, T1552
Attack vector
physical
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=Kernel 5.6 <05.63.21
  2. Affected versionversion=Kernel 5.7 <05.72.21

What conditions does exploitation require?

Attack vectorphysical
Required privilegesauthenticated

What is affected?

Insyde Software · InsydeH2O UEFI BIOSversion=Kernel 5.6 <05.63.21; version=Kernel 5.7 <05.72.21

Published CVSS scores

6.9InsydeCVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

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)
Vectorphysical
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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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