CVE-2026-8661

mediumCVSS 4.8covered by 1 sourcefirst seen 2026-06-26

Server-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.

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Exploitation outlook

Low exploitation risk0.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-8661: Server-Side Cross-Site Scripting and Server-Side Request Forgery vulnerability in the markdown_…nvd · 2026-06-26

External references

NVD record for CVE-2026-8661

CVE.org record

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