CVE-2026-55086
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 4.2
- CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
- EPSS probability
- 0.12%
- CWE
- CWE-59, CWE-377
- Published
- 2026-08-19
- Last modified
- 2026-08-25
Affected products
- ether etherpad
Weakness type
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