# CVE-2026-55086

## Summary

- **CVE ID:** CVE-2026-55086
- **Severity:** MEDIUM
- **CVSS Score:** 4.2 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **CWE:** CWE-59, CWE-377
- **Published:** Aug 19, 2026
- **Last Modified:** Aug 25, 2026

## Description

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.

## Affected Products

- ether — etherpad (< 3.1.0)

## References

- [CNA](https://github.com/ether/etherpad/pull/7784)
- [CNA](https://github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h)
- [CNA](https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996)
- [CNA](https://github.com/ether/etherpad/releases/tag/v3.1.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.12%
- **EPSS Percentile:** 2.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._