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CVE-2026-84992

6.1 · MEDIUM

md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript.

Published Sep 18, 2026CWE-79EPSS 0.33%

Overview

CVE-2026-84992 is a medium-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

md-editor-v3 is a Markdown editor for Vue 3 developed in JSX and TypeScript. Prior to 6.5.4, MdPreview's useMarkdownIt() highlight callback in packages/MdEditor/layouts/Content/composition/useMarkdownIt.ts inserts a fenced-code language value into class and language HTML attributes without escaping or consistently quoting it. Both highlighted and non-highlighted rendering paths reach this return value, while XSSPlugin filters only existing html_block and html_inline tokens before rendering and therefore cannot inspect the renderer-generated HTML. An attacker who can supply Markdown can use crafted fenced-code metadata to execute JavaScript in the application origin when a victim renders it, including as stored cross-site scripting when the host persists the Markdown. This issue is fixed in version 6.5.4

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/imzbf/md-editor-v3/commit/2c07360420e74087f5bc63032ab155d93e0a0b10GitHubgithub.com/imzbf/md-editor-v3/releases/tag/v6.5.4GitHubgithub.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6GitHubgithub.com/imzbf/md-editor-v3/security/advisories/GHSA-3rm2-h79c-8qw6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-84992?

CVE-2026-84992 is a medium-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-84992?

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-84992?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-84992?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-84992 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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