---
cve: "CVE-2026-111927"
severity: "HIGH"
cvss: 8.7
epss: "0.2%"
vendor: "coder"
kev: false
exploited: false
published: "2026-10-17 19:16:35"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-11-01T18:40:45+01:00"
---

# CVE-2026-111927

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Coder before 2.29.20, 2.33.0 before 2.33.12, 2.34.0 before 2.34.8, and 2.35.0 before 2.35.4 contains an improper hostname validation flaw in GetWorkspaceProxyByHostname whose SIMILAR TO pattern performs a prefix match, so any domain that is a string prefix of a workspace-proxy access URL is trusted as a proxy. Attackers owning such a domain can lure an authenticated victim to a crafted /api/v2/applications/auth-redirect link, capture the redirected application_connect API key, and replay it to access the victim's workspace apps.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-21 21:45:39
- CNA-CVSS: **8.7** (`CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |

## Schwachstellen-Klasse

- **CWE-522** — Insufficiently Protected Credentials
  The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.

## Angriffsmuster (CAPEC)

- [CAPEC-50 — Password Recovery Exploitation](https://capec.mitre.org/data/definitions/50.html) _(Severity: High)_
- [CAPEC-102 — Session Sidejacking](https://capec.mitre.org/data/definitions/102.html) _(Severity: High)_
- [CAPEC-474 — Signature Spoofing by Key Theft](https://capec.mitre.org/data/definitions/474.html) _(Severity: High)_
- [CAPEC-509 — Kerberoasting](https://capec.mitre.org/data/definitions/509.html) _(Severity: High)_
- [CAPEC-551 — Modify Existing Service](https://capec.mitre.org/data/definitions/551.html)
- [CAPEC-555 — Remote Services with Stolen Credentials](https://capec.mitre.org/data/definitions/555.html) _(Severity: Very High)_
- [CAPEC-560 — Use of Known Domain Credentials](https://capec.mitre.org/data/definitions/560.html) _(Severity: High)_
- [CAPEC-561 — Windows Admin Shares with Stolen Credentials](https://capec.mitre.org/data/definitions/561.html)

## ATT&CK-Techniken

- [T1552.004 — Unsecured Credentials: Private Keys](https://attack.mitre.org/techniques/T1552/004/)
- [T1558.003 — Steal or Forge Kerberos Tickets:Kerberoasting](https://attack.mitre.org/techniques/T1558/003/)
- [T1543 — Create or Modify System Process](https://attack.mitre.org/techniques/T1543/)
- [T1021 — Remote Services](https://attack.mitre.org/techniques/T1021/)
- [T1114.002 — Email Collection:Remote Email Collection](https://attack.mitre.org/techniques/T1114/002/)
- [T1133 — External Remote Services](https://attack.mitre.org/techniques/T1133/)
- [T1078 — Valid Accounts](https://attack.mitre.org/techniques/T1078/)
- [T1021.002 — Remote Services:SMB/Windows Admin Shares](https://attack.mitre.org/techniques/T1021/002/)

## Patch verfügbar (OSV)

- 81add7e766144e50b4e4499b81582f997cc6a26c (Commit)
- 7bd778d8815624fd2b598d9432092162437c06b3 (Commit)

## Referenzen

- <https://github.com/coder/coder/security/advisories/GHSA-h58h-qvv5-xvwg>
- <https://www.vulncheck.com/advisories/coder-before-2.35.4-credential-theft-via-workspace-proxy-hostname-prefix-match>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-111927/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_