CVE-2026-8863
highpriority · track · 10EPSS 0.001 · 1 %ileexploit · PoCDEEUJPNLRUEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (1)
Public proof-of-concept and weaponised exploit code.
affected products (138)
Products and version ranges known to be affected.
- Hitachi Virtual Storage Platform 5100all versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:5100
- Hitachi Virtual Storage Platform 5100Hall versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:5100h
- Hitachi Virtual Storage Platform 5200all versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:5200
- Hitachi Virtual Storage Platform 5200Hall versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:5200h
- Hitachi Virtual Storage Platform 5500all versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:5500
- Hitachi Virtual Storage Platform 5500Hall versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:5500h
- Hitachi Virtual Storage Platform 5600all versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:5600
- Hitachi Virtual Storage Platform 5600Hall versionscert_bundDEcpe:/h:hitachi:virtual_storage_platform:5600h
- Microsoft Windows App Client for Desktopall versionscert_bundDEcpe:/o:microsoft:windows:app_client_for_desktop
- Microsoft Windows Remote Desktop Clientall versionscert_bundDEcpe:/o:microsoft:windows:remote_desktop_client_for_desktop
advisories (3)
Vendor and ecosystem advisories describing this.
- NCSC-2026-0181Kwetsbaarheden verholpen in Microsoft WindowsNL2026-06-09csaf · ncsc_nlNL
Microsoft heeft een groot aantal kwetsbaarheden verholpen in Windows.
- WID-SEC-W-2026-1849Microsoft Windows: Mehrere SchwachstellenDeutsch2026-06-09csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows und Microsoft Windows Server ausnutzen, um Administratorrechte zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren und offenzulegen oder Spoofing-Angriffe durchzuführen.
- JVNDB-2026-029749JVN iPedia advisory JVNDB-2026-0297492026-08-24vendor · jvndbJP
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8863cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2026-8863cnnvd
- https://kb.cert.org/vuls/id/616257enisa_euvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8863enisa_euvd
- https://kb.cert.org/vuls/id/616257nvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8863nvd
- https://www.kb.cert.org/vuls/id/616257nvd
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