---
cve: "CVE-2026-63088"
severity: "HIGH"
cvss: 7.7
epss: "0.5%"
vendor: "stoatchat"
kev: false
exploited: false
published: "2026-07-16 17:16:58"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-29T01:57:00+02:00"
---

# CVE-2026-63088

> 7.7 HIGH · 🧪 PoC

## Beschreibung

stoatchat before 0.14.0 contains a server-side request forgery (SSRF) vulnerability that allows unauthenticated network-accessible attackers to bypass the DNS-based IP blocklist by exploiting incomplete address validation in the url_is_blacklisted function, which inspects only the first resolved address while the underlying HTTP client iterates all cached addresses.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 07217dfac43cacf02e4ed805ccb3330d4b37e1a9 (Commit)

## Referenzen

- <https://github.com/stoatchat/stoatchat/security/advisories/GHSA-4mcc-p83c-r77q>
- <https://github.com/stoatchat/stoatchat/releases/tag/v0.14.0>
- <https://github.com/stoatchat/stoatchat/security/advisories/GHSA-xhww-5g9p-vvq5>
- <https://www.vulncheck.com/advisories/stoatchat-ssrf-via-dns-based-ip-blocklist-bypass>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-63088) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_