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CVE-2026-12856
Description
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.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HReferences
- https://access.redhat.com/security/cve/CVE-2026-12856
- https://bugzilla.redhat.com/show_bug.cgi?id=2491278
- https://github.com/redhat-developer/vscode-java/security/advisories/GHSA-7qv8-6qrw-3crv
- https://access.redhat.com/security/cve/CVE-2026-12856
- https://bugzilla.redhat.com/show_bug.cgi?id=2491278
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12856.json