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CVE-2026-55168

MediumPublished

Runtipi: Authenticated arbitrary file write via backup restore symlink planting

Published: Aug 21, 2026
Updated: Aug 25, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 28, 2026

Primary CVSS

6.5/ 10Medium

cvelist · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 43.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-55168PoC
Proof-of-concept exploit for CVE-2026-55168 demonstrating authenticated arbitrary file write via symlink planting during backup restore in Runtipi.

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