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CVE-2026-8661— Server-Side Cross-Site Scripting and SSRF in Rapid7 InsightConnect Markdown to PDF Plugin

Quick assessment

Affected
Rapid7 InsightConnect Markdown Plugin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rapid7 InsightConnect Markdown Plugin是美国Rapid7公司开源的一款InsightConnect平台的Markdown插件。 Rapid7 InsightConnect Markdown Plugin 3.1.4及之前版本存在安全漏洞，该漏洞源于markdown_to_pdf操作中的服务器端跨站脚本和服务端请求伪造，PDF渲染引擎未限制脚本执行或出站网络访问，可能导致远程攻击者通过Markdown输入中的特制内容执行服务器端JavaScript并发送任意出站HTTP请

CVSS 4.8 · Medium EPSS 0.38% · P31

Affected Version Matrix 2

VendorProduct Version RangeStatus
Rapid7 InsightConnect Markdown Plugin < 4.0.2 affected
4.0.2 unaffected
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I. Basic Information for CVE-2026-8661

Vulnerability Information
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Vulnerability Title
Server-Side Cross-Site Scripting and SSRF in Rapid7 InsightConnect Markdown to PDF Plugin
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Rapid7 InsightConnect Markdown Plugin 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rapid7 InsightConnect Markdown Plugin是美国Rapid7公司开源的一款InsightConnect平台的Markdown插件。 Rapid7 InsightConnect Markdown Plugin 3.1.4及之前版本存在安全漏洞，该漏洞源于markdown_to_pdf操作中的服务器端跨站脚本和服务端请求伪造，PDF渲染引擎未限制脚本执行或出站网络访问，可能导致远程攻击者通过Markdown输入中的特制内容执行服务器端JavaScript并发送任意出站HTTP请
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Rapid7 InsightConnect Markdown Plugin 0 ~ 4.0.2 -

II. Public POCs for CVE-2026-8661

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III. Intelligence Information for CVE-2026-8661

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Patches & Fixes for CVE-2026-8661 (3)

IV. Related Vulnerabilities

Same vendor: Rapid7
Same weakness: CWE-79