---
cve: "CVE-2026-86729"
severity: "CRITICAL"
cvss: 9.1
epss: "0.4%"
vendor: "WWBN"
kev: false
exploited: false
published: "2026-09-08 16:18:34"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-21T22:37:10+02:00"
---

# CVE-2026-86729

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

WWBN AVideo through commit e01e41ecc (no patched version available) exposes get_api_preauthorize in plugin/API/API.php as a second, undocumented login path. Unlike get_api_signIn, which enforces a rate limit of 10 attempts per 5 minutes via checkRateLimit(), get_api_preauthorize performs the same credential check with no throttling for any client, allowing unlimited remote password guessing against arbitrary accounts, including admin. The endpoint also acts as a credential oracle: it returns the message "Invalid credentials" for both correct and incorrect passwords, while the users_id field in the response body discloses the authenticated identity (users_id:1 on success, users_id:0 on failure), and a correct password establishes a session cookie that remains usable for authenticated API requests. Together these issues permit unauthenticated brute-force account takeover.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-09-10 15:02:34
- CNA-CVSS: **9.1** (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/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 |

## Schwachstellen-Klasse

- **CWE-307** — Improper Restriction of Excessive Authentication Attempts
  The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.

## Angriffsmuster (CAPEC)

- [CAPEC-16 — Dictionary-based Password Attack](https://capec.mitre.org/data/definitions/16.html) _(Severity: High)_
- [CAPEC-49 — Password Brute Forcing](https://capec.mitre.org/data/definitions/49.html) _(Severity: High)_
- [CAPEC-560 — Use of Known Domain Credentials](https://capec.mitre.org/data/definitions/560.html) _(Severity: High)_
- [CAPEC-565 — Password Spraying](https://capec.mitre.org/data/definitions/565.html) _(Severity: High)_
- [CAPEC-600 — Credential Stuffing](https://capec.mitre.org/data/definitions/600.html) _(Severity: High)_
- [CAPEC-652 — Use of Known Kerberos Credentials](https://capec.mitre.org/data/definitions/652.html) _(Severity: High)_
- [CAPEC-653 — Use of Known Operating System Credentials](https://capec.mitre.org/data/definitions/653.html) _(Severity: High)_

## ATT&CK-Techniken

- [T1110.001 — Brute Force:Password Guessing](https://attack.mitre.org/techniques/T1110/001/)
- [T1078 — Valid Accounts](https://attack.mitre.org/techniques/T1078/)
- [T1110.003 — Brute Force:Password Spraying](https://attack.mitre.org/techniques/T1110/003/)
- [T1110.004 — Brute Force:Credential Stuffing](https://attack.mitre.org/techniques/T1110/004/)
- [T1558 — Steal or Forge Kerberos Tickets](https://attack.mitre.org/techniques/T1558/)

## Referenzen

- <https://github.com/WWBN/AVideo/security/advisories/GHSA-vvqm-mgc5-hhx3>
- <https://www.vulncheck.com/advisories/wwbn-avideo-unrestricted-authentication-attempts-via-get-api-preauthorize>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-86729/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_