---
cve: "CVE-2026-61503"
severity: "MEDIUM"
cvss: 6.9
epss: "0.4%"
vendor: "Rejetto"
kev: false
exploited: false
published: "2026-07-13 18:16:30"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-01T08:52:46+02:00"
---

# CVE-2026-61503

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

Rejetto HFS 3.0.0 through 3.2.0 returns observably different responses from its login endpoint depending on whether the submitted username exists. A remote unauthenticated attacker can use this to confirm valid account names, including the default admin account, facilitating password-guessing and session-forgery attacks.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

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

- 15f0eb32f856016b6a3a04c8679b9a12eb18c203 (Commit)

## Referenzen

- <https://github.com/rejetto/hfs/releases/tag/v3.2.1>
- <https://www.vulncheck.com/advisories/rejetto-hfs-username-enumeration-via-login-response-differences>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-61503) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_