---
cve: "CVE-2026-8661"
severity: "MEDIUM"
cvss: 4.8
epss: "0.4%"
vendor: "Rapid7"
kev: false
exploited: false
published: "2026-06-26 01:59:58"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-05T05:16:06+02:00"
---

# CVE-2026-8661

> 4.8 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 1bffe29a471ad9d293bd9e3acae279544ae1b33c (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-8661) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_