CVE-2026-8661

MEDIUM 4.8

Server-Side Cross-Site Scripting and SSRF in Rapid7 InsightConnect Markdown to PDF Plugin

CVSS Score

4.8

EPSS Score

0.3%

EPSS Percentile

17th

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.

CWE	CWE-79 CWE-918
Vendor	rapid7
Product	insightconnect markdown plugin
Published	Jun 26, 2026
Last Updated	Jul 24, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Rapid7 / InsightConnect Markdown Plugin

0 < 4.0.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/rapid7/insightconnect-plugins/blob/master/plugins/markdown/help.md github.com: https://github.com/rapid7/insightconnect-plugins/pull/3721 github.com: https://github.com/rapid7/insightconnect-plugins/pull/4010

Credits

Jacob Steadman, Rapid7 Jed Starr, Rapid7 🔍 SnailSploit (Kai Aizen)