CVE-2026-8863
CVE-2026-8863
No known exploitation. EPSS puts it in the 1st percentile. No fix published yet.
What to do
No fixed build or workaround is published yet. Limit exposure and watch for a patch.
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.1% chance of exploitation activity in the next 30 days, which ranks it in the 1st percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
4 events over 44 days, from the signal feeds we watch.
- Record updated
- OpenVAS check added
- Publishedrecord updated
Affected products
- Service Center EnterpriseConsumer Software / file-utility
- Service Center Drive EraseConsumer Software / file-utility
- Service Center JapanConsumer Software / file-utility
- Service CenterConsumer Software / file-utility
- Network Factory for Linux (Bootable Diagnostics)Consumer Software / file-utility
- Factory for Linux (Bootable Diagnostics)Consumer Software / file-utility
And 2 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Scored 7.8 by NVD.
How it is reached
- Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required LowRequires basic user-level privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Sources
References in the record
In the news
- Old UEFI Shims Expose Systems to Secure Boot Bypass
- 11 Old Microsoft-Signed Linux UEFI Shims Could Let Attackers Bypass Secure Boot
- No one knows how many old shims can still bypass UEFI Secure Boot
- Forgotten UEFI shims undermining Secure Boot
- Microsoft Patches Record 206 Flaws, Including Three Zero-Days and Critical RCE Bugs
- Rapid7
- Microsoft June 2026 Patch Tuesday fixes 6 zero-days, 200 flaws
- Microsoft June 2026 Patch Tuesday fixes 3 zero-day, 200 flaws
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