---
cve: "CVE-2026-76239"
severity: "MEDIUM"
cvss: 5.3
epss: "0.3%"
vendor: "eidetic-labs"
kev: false
exploited: false
published: "2026-08-19 14:17:56"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T13:03:39+02:00"
---

# CVE-2026-76239

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

Stigmem before 0.9.0a11 fails to validate the delivery_address parameter when creating webhook subscriptions, allowing authenticated users to specify internal loopback and private network destinations. Attackers can trigger matching fact-change events to cause the Stigmem server to issue server-side HTTP POST requests to internal services, enabling blind SSRF attacks against localhost and private network endpoints.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 11637401d50629fef040382aee5af4571842c152 (Commit)

## Referenzen

- <https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236>
- <https://www.vulncheck.com/advisories/stigmem-before-0a11-ssrf-via-unvalidated-webhook-delivery-address>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-76239) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_