---
cve: "CVE-2026-111675"
severity: "CRITICAL"
cvss: 9.1
epss: "0.5%"
vendor: "xiaochong0302"
kev: false
exploited: false
published: "2026-10-16 18:17:50"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-10T01:35:31+01:00"
---

# CVE-2026-111675

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

Course-tencent-cloud through 2.0.1 contains an improper restriction of authentication attempts vulnerability that allows unauthenticated attackers to brute force 6-digit SMS/email verification codes, which are never invalidated or attempt-limited. Attackers who know a victim's phone or email can trigger a code and rotate source IPs against the password reset and verify login endpoints to take over accounts.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-19 13:27:20
- CNA-CVSS: **9.1** (`CVSS:4.0/AV:N/AC:H/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: **poc**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:H/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 | Hoch | good |
| 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://hackmd.io/@hieuPenguinnn/ctc-verify-code-brute-force-account-takeover>
- <https://github.com/xiaochong0302/course-tencent-cloud/blob/v2.0.1/app/Services/Verify.php#L27-L73>
- <https://github.com/xiaochong0302/course-tencent-cloud/blob/v2.0.1/app/Services/Logic/Account/PasswordReset.php>
- <https://www.vulncheck.com/advisories/course-tencent-cloud-through-2.0.1-verification-code-brute-force-account-takeover>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-111675/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_