---
cve: "CVE-2026-116748"
severity: "HIGH"
cvss: 8.7
epss: ""
vendor: "transmission"
kev: false
exploited: false
published: "2026-10-26 22:16:59"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-28T09:14:55+01:00"
---

# CVE-2026-116748

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Transmission 4.0.0 before 4.1.3 contains a permissive CORS vulnerability in handle_request() in rpc-server.cc that exposes the X-Transmission-Session-Id anti-CSRF token to any web origin. Malicious web pages can read the token from the 409 handshake response and replay it to issue RPC calls, enabling script-torrent-done execution, download-dir changes, or torrent and data deletion.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-26 21:52:45
- CNA-CVSS: **8.7** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Schwachstellen-Klasse

- **CWE-942** — Permissive Cross-domain Security Policy with Untrusted Domains
  The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate.

## Patch verfügbar (OSV)

- 838877323facc4cc2b677fe817e203779c437bb1
- c6a1bd2017a0fea9c956737c213f23e4b0f7929e

## Referenzen

- <https://github.com/transmission/transmission/pull/8938>
- <https://github.com/transmission/transmission/commit/c6a1bd2017a0fea9c956737c213f23e4b0f7929e>
- <https://github.com/transmission/transmission>
- <https://github.com/transmission/transmission/releases/tag/4.1.3>
- <https://github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.cc#L560>
- <https://joshua.hu/transmission-cors-rpc-csrf-rce-drive-by-exploit>
- <https://www.vulncheck.com/advisories/transmission-4.0.0-before-4.1.3-permissive-cors-leaks-rpc-anti-csrf-token>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-116748/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_