---
cve: "CVE-2026-55086"
severity: "MEDIUM"
cvss: 4.2
epss: "14%"
vendor: "ether"
kev: false
exploited: false
published: "2026-08-19 20:17:17"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-04T07:40:09+02:00"
---

# CVE-2026-55086

> 4.2 MEDIUM · 🧪 PoC

## Beschreibung

Etherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared world-writable temporary directory, a local unprivileged attacker who predicts a filename can precreate a symbolic link to a file writable by the Etherpad process. Subsequent import or export operations can follow the link through fs.writeFile, fs.rename, or document-conversion output and overwrite the target with partially attacker-controlled content. This issue is fixed in version 3.1.0.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 8c6104c5d5daf41f0d454acc04d42dffa0e0d996 (Commit)
- fa1c6b2e43d0510c851643cb7ba67cf042331a37 (Commit)

## Referenzen

- <https://github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h>
- <https://github.com/ether/etherpad/pull/7784>
- <https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996>
- <https://github.com/ether/etherpad/releases/tag/v3.1.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55086) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_