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.

Scores

EPSS (exploitation in 30 days)

0.11% · top 99% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Weakness

• CWE-347: Improper Verification of Cryptographic Signature
• CWE-354: Improper Validation of Integrity Check Value

Affected products

• Oracle Corporation · OracleLinux(7.2) shim

  • affected 0.9

• PC-Doctor · Service Center Enterprise

  • affected 14 – ≤ 17.0.7536.900

• PC-Doctor · Service Center Drive Erase

  • affected 15 – ≤ 17.0.7538.592

• PC-Doctor · Service Center Japan

  • affected 15 – ≤ 17.0.7539.904

• PC-Doctor · Service Center

  • affected 14 – ≤ 17.0.7535.900

• PC-Doctor · Network Factory for Linux (Bootable Diagnostics)

  • affected 6.9 – ≤ 6.20.7711.267

• PC-Doctor · Factory for Linux (Bootable Diagnostics)

  • affected 6.9 – ≤ 6.20.7710.267

• Spyrus · WTGCreator

  • affected 4.2

• Blancco UK · WhiteCanyon WipeDrive

  • affected 8.0.0 – ≤ 8.1.3

• baramundi software · baramundi Management Suite

  • affected ≤ 2024R1

• SUSE Linux · OpenSUSE shim

  • affected 0.9

• Finland Matriculation Board · Abitti 1

  • affected 1.0.0

• NTC IT ROSA LLC · RosaLinux

  • affected R9

• NTC IT ROSA LLC · RosaLinux

  • affected R10

References (3)

• Microsoft Vendor Security Advisory (opens in a new tab)vendor-advisory
• CERT/CC Vulnerability Notice (opens in a new tab)third-party-advisory
• https://www.kb.cert.org/vuls/id/616257 (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-8863](https://trackcve.app/badge/CVE-2026-8863.svg)](https://trackcve.app/cve/CVE-2026-8863)

Record last updated 10 Jun 2026, 15:16 UTC.