CVE-2026-8863

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Summary

CVECVE-2026-8863
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-09 19:17:59 UTC
Updated2026-06-09 21:17:26 UTC
DescriptionMultiple Microsoft-sigend UEFI SHIM bootloaders are vulnerable to SecureBoot bypass. An attacker with administrative privileges or the ability to modify the boot process could use one of the vulnerable shim bootloaders to bypass Secure Boot protections and execute arbitrary code before the operating system loads. Specific UEFI DBX update is required to block these vulnerable boot loaders.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-347: Improper Verification of Cryptographic Signature | CWE-354: Improper Validation of Integrity Check Value

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Oracle Corporation OracleLinux7.2 Shim affected 0.9 Not specified
CNA PC-Doctor Service Center Enterprise affected 14 17.0.7536.900 custom Not specified
CNA PC-Doctor Service Center Drive Erase affected 15 17.0.7538.592 custom Not specified
CNA PC-Doctor Service Center Japan affected 15 17.0.7539.904 custom Not specified
CNA PC-Doctor Service Center affected 14 17.0.7535.900 custom Not specified
CNA PC-Doctor Network Factory For Linux Bootable Diagnostics affected 6.9 6.20.7711.267 custom Not specified
CNA PC-Doctor Factory For Linux Bootable Diagnostics affected 6.9 6.20.7710.267 custom Not specified
CNA Spyrus WTGCreator affected 4.2 Not specified
CNA Blancco UK WhiteCanyon WipeDrive affected 8.0.0 8.1.3 custom Not specified
CNA Baramundi Software Baramundi Management Suite affected * 2024R1 custom Not specified
CNA Finland Matriculation Board Abitti 1 affected 1.0.0 Not specified
CNA NTC IT ROSA LLC RosaLinux affected R9 Not specified
CNA NTC IT ROSA LLC RosaLinux affected R10 Not specified

References

ReferenceSourceLinkTags
kb.cert.org/vuls/id/616257 [email protected] kb.cert.org
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8863 [email protected] msrc.microsoft.com
www.kb.cert.org/vuls/id/616257 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Thanks to Martin Smolar of ESET for discovering and reporting this vulnerability (en)

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