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 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.

CVSS 3.1

4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-25)

CWEs

CWE-79, CWE-918

Published

2026-06-26

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

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

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