# CVE-2026-8661: Server-Side Cross-Site Scripting and SSRF in Rapid7 InsightConnect Markdown to PDF Plugin

> Remote attackers can trigger Server-Side Request Forgery and XSS via unsanitized Markdown input in the Rapid7 InsightConnect Markdown to PDF plugin.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2026
- **Updated:** 24 Jul 2026
- **Also known as:** GHSA-6r62-qf74-xpgg

## What is CVE-2026-8661?

CVE-2026-8661 is a medium-severity server-side request forgery vulnerability in Rapid7 InsightConnect Markdown Plugin, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-918 (Server-Side Request Forgery), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-8661?


## How do I fix CVE-2026-8661?

No fix has been published for CVE-2026-8661 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8661 being exploited?

There is no known exploitation of CVE-2026-8661 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8661 and fix it if it is affected.

What it is: CVE-2026-8661 is a medium-severity server-side request forgery vulnerability in Rapid7 InsightConnect Markdown Plugin, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-8661 in the wild and no public exploit code.

Affected product: Rapid7 InsightConnect Markdown Plugin. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-8661/ (Markdown: https://insights.sbomify.com/CVE-2026-8661/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8661
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8661
- OSV: https://osv.dev/vulnerability/CVE-2026-8661

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-8661/
Summaries are generated and may contain mistakes; the official description above is the record.