CVE-2026-8661
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
The Markdown plugin for Rapid7 InsightConnect on Linux before version 4.0.2 is vulnerable to Server-Side Request Forgery (SSRF). An attacker can make arbitrary HTTP requests via unsanitized HTML elements in Markdown, such as `img/src`, `CSS url()`, or `@import`.
Risk Assessment
An attacker can use the server to scan internal networks, access sensitive services, or perform unauthorized actions on behalf of the server.
Recommendation
Upgrade the Markdown plugin to version 4.0.2 or later.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

