# CVE-2026-55168

## Summary

- **CVE ID:** CVE-2026-55168
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H)
- **CWE:** CWE-59, CWE-61
- **Published:** Aug 21, 2026
- **Last Modified:** Aug 25, 2026

## Description

Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.

## Affected Products

- runtipi — runtipi (< 4.10.1)

## References

- [CNA](https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7)
- [CNA](https://github.com/runtipi/runtipi/pull/2606)
- [CNA](https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c)
- [CNA](https://github.com/runtipi/runtipi/releases/tag/v4.10.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.53%
- **EPSS Percentile:** 43.0

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