What is CVE-2026-8661?

CVE-2026-8661 is a medium-severity vulnerability in Rapid7 Insightconnect Markdown Plugin, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-06-26.

How severe is CVE-2026-8661?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Rapid7 Insightconnect Markdown Plugin

CVE-2026-8661

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 e…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (15.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Rapid7 Insightconnect Markdown Plugin — versions 4.0.2, 4.0.0, 0

Weakness classification (CWE)

References

cve@rapid7.com (vendor-advisory)
cve@rapid7.com (patch)
cve@rapid7.com (patch)

Frequently asked questions

What is CVE-2026-8661?: CVE-2026-8661 is a medium-severity vulnerability in Rapid7 Insightconnect Markdown Plugin, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-06-26.
How severe is CVE-2026-8661?: Medium severity. CVSS v3 base score is 4.8 out of 10.