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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-8661
StatePUBLISHED
Assignerrapid7
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 02:16:54 UTC
Updated2026-06-26 20:22:40 UTC
DescriptionServer-Side Cross-Site Scripting and Server-Side Request Forgery vulnerability in the markdown_to_pdf action of Rapid7 InsightConnect Markdown Plugin version 3.1.4 and earlier on Linux allows remote attackers to execute JavaScript server-side and make arbitrary outbound HTTP requests via crafted content embedded in Markdown input. The PDF rendering engine does not restrict script execution or outbound network access.

Risk And Classification

Primary CVSS: v3.1 4.8 MEDIUM from [email protected]

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

EPSS: 0.002540000 probability, percentile 0.166730000 (date 2026-06-29)

Problem Types: CWE-79 | CWE-918 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CWE-918 CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNACVSS4.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rapid7 InsightConnect Markdown Plugin affected 4.0.0 custom Linux
CNA Rapid7 InsightConnect Markdown Plugin unaffected 4.0.0 custom Linux

References

ReferenceSourceLinkTags
github.com/rapid7/insightconnect-plugins/pull/3721 [email protected] github.com
github.com/rapid7/insightconnect-plugins/blob/master/plugins/markdown/he... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Jacob Steadman, Rapid7 (en)

CNA: Jed Starr, Rapid7 (en)

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