---
cve: "CVE-2026-42346"
severity: "MEDIUM"
cvss: 6.5
epss: "22%"
vendor: "gitroomhq"
kev: false
exploited: false
published: "2026-05-08 23:16:37"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T06:50:02+02:00"
---

# CVE-2026-42346

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

Postiz is an AI social media scheduling tool. From version 2.16.6 to before version 2.21.7, all SSRF protections added in v2.21.4–v2.21.6 share a fundamental TOCTOU (Time-of-Check-Time-of-Use) vulnerability: isSafePublicHttpsUrl() resolves DNS to validate the target IP, but subsequent fetch() calls resolve DNS independently. An attacker controlling a DNS server can exploit this gap via DNS rebinding to redirect requests to internal network addresses. This issue has been patched in version 2.21.7.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/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 | Hoch | bad |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 7236213ea4520bd67b45688c2787d1f4586b3b51 (Commit)

## Referenzen

- <https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45>
- <https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb>
- <https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-42346) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_