How severe is CVE-2026-12856?

CVE-2026-12856 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-12856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-12856?

CVE-2026-12856 affects Redhat Openshift Dev Spaces. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-12856?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-12856 published?

CVE-2026-12856 was published on 2026-06-29 and last updated on 2026-07-08.

CVE-2026-12856

CVE-2026-12856 is a high-severity vulnerability in Redhat Openshift Dev Spaces with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-88.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-88
Affected product: Redhat Openshift Dev Spaces
Published: 2026-06-29
Last modified: 2026-07-08

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.

Frequently asked questions

What is CVE-2026-12856?: 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.
How severe is CVE-2026-12856?: CVE-2026-12856 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-12856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-12856?: CVE-2026-12856 affects Redhat Openshift Dev Spaces. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-12856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-12856 published?: CVE-2026-12856 was published on 2026-06-29 and last updated on 2026-07-08.

References

Affected products (1)

cpe:2.3:a:redhat:openshift_dev_spaces:-:*:*:*:*:*:*:*

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