CVE-2026-8863
CVE-2026-8863
Description
Multiple 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.
INFO
Published Date :
June 9, 2026, 7:17 p.m.
Last Modified :
June 9, 2026, 8:17 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update UEFI SHIM bootloaders.
- Apply vendor patches.
- Validate Secure Boot enforcement.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-8863.
| URL | Resource |
|---|---|
| https://kb.cert.org/vuls/id/616257 | |
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8863 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-8863 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-8863
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-8863 vulnerability anywhere in the article.
-
Zero Day Initiative
The June 2026 Security Update Review
CVE Title Severity CVSS Public Exploited XI Type CVE-2026-41091 Microsoft Defender Elevation of Privilege Vulnerability Important 7.8 Yes Yes 0 EoP CVE-2026-49160 HTTP.sys Denial of Service Vulnerabil ... Read more
The following table lists the changes that have been made to the
CVE-2026-8863 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 09, 2026
Action Type Old Value New Value Changed Description Multiple version of UEFI SHIM bootloaders are vulnerable to SecureBoot bypass through lack of enforcement and validation SBAT. The following authenticode signatures are impacted by this disclosure AE75F0D82BA3DF824FBFC69340CC3B4D66C598373B1AB54CDB6C8BFD83A6B961 - Spyrus WTGCreator version 4.2 FD23D6E57DE6F4E1F9D7118DA1C5F31A8AF6BE5E5D9E8170F9493447268D50C5 - Baramundi Management Suite up to 2024R1 - A0DE9333442C1BF9349A460141AE5E80F911955C6506040FA3D021BF6C1AE3E4 WhiteCanyon WipeDrive versions 8.0.0 through 8.1.3. 95B6D71FC0C0F8C5E1533A37AEF92CF6B0C961E2CC612A97117FA6759CE5FC06 - Finland Matriculation Exam Abitti 1 version 1.0.0 236A9CB0D71951C36398A32EB660CE2CD4A52CCFA7CF751CC6A35D9DE549E19B - NTC IT Rosa R9, R10 8A964D5F8373948D20A1D4296FB92E545DAD4617A0C810F3B934B53D98AE8963 - PC-Doctor Service Center 15, 16 Multiple 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. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by [email protected]
Jun. 09, 2026
Action Type Old Value New Value Added Description Multiple version of UEFI SHIM bootloaders are vulnerable to SecureBoot bypass through lack of enforcement and validation SBAT. The following authenticode signatures are impacted by this disclosure AE75F0D82BA3DF824FBFC69340CC3B4D66C598373B1AB54CDB6C8BFD83A6B961 - Spyrus WTGCreator version 4.2 FD23D6E57DE6F4E1F9D7118DA1C5F31A8AF6BE5E5D9E8170F9493447268D50C5 - Baramundi Management Suite up to 2024R1 - A0DE9333442C1BF9349A460141AE5E80F911955C6506040FA3D021BF6C1AE3E4 WhiteCanyon WipeDrive versions 8.0.0 through 8.1.3. 95B6D71FC0C0F8C5E1533A37AEF92CF6B0C961E2CC612A97117FA6759CE5FC06 - Finland Matriculation Exam Abitti 1 version 1.0.0 236A9CB0D71951C36398A32EB660CE2CD4A52CCFA7CF751CC6A35D9DE549E19B - NTC IT Rosa R9, R10 8A964D5F8373948D20A1D4296FB92E545DAD4617A0C810F3B934B53D98AE8963 - PC-Doctor Service Center 15, 16 Added Reference https://kb.cert.org/vuls/id/616257 Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8863