CVE-2026-12856

Vscode-java: vscode: command injection vulnerability in the javadoc hover provider of the vscode-java extension

8.8 High

A flaw was found in the vscode-java extension, which provides Java language support for Visual Studio Code. The extension incorrectly trusts all Markdown content in JavaDoc hovers, allowing a malicious Java file to include hidden commands. If a user clicks a specially crafted link within a JavaDoc hover popup, an attacker can execute arbitrary VS Code commands, which can lead to full system compromise in trusted workspaces.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.55%Up 0.3 points since Jun 30, 2026

What each source reports

CVE List Score used 8.8

Vscode-java: vscode: command injection vulnerability in the javadoc hover provider of the vscode-java extension

Record: CVE-2026-12856
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-88, CWE-88
Updated: 2026-11-02

EUVDEUVD-2026-40084 8.8

Record: EUVD-2026-40084
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-7vqr-7r5j-c84j 8.8

A flaw was found in the vscode-java extension, which provides Java language support for Visual...

Record: GHSA-7vqr-7r5j-c84j
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-88
Updated: 2026-11-02

NVD 8.8

Record: CVE-2026-12856
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-88
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-12856 is a high vulnerability (CVSS 8.8) in Red Hat Openshift Dev Spaces 3.29, published June 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. No source names a fixed version.