CVE-2026-8661: RAPID7 Insightconnect Markdown Plugin

Medium severity, CVSS 4.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Server-Side Request Forgery in the markdown_to_pdf action of Rapid7 InsightConnect Markdown Plugin on Linux in versions prior to 4.0.2 allows remote attackers to make arbitrary outbound HTTP requests via unsanitized resource-loading HTML elements (img/src, CSS url(), @import) embedded in Markdown input. The initial fix in 4.0.0 disabled JavaScript but did not neutralize resource-loading vectors. Resolved in 4.0.2 by sanitizing HTML with an allowlist of tags, attributes, and URL schemes.

Affected products

• RAPID7 Insightconnect Markdown Plugin: before 4.0.2 (fixed in 4.0.2)

Published 2026-06-26. Last modified 2026-07-24.