CVE-2026-55168

Runtipi: Authenticated arbitrary file write via backup restore symlink planting

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

runtipi

CVSS v3.1 GITHUB

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

EPSS

0.61% chance of exploitation in the next 30 days, 48th percentile

Published

2026-08-21

Updated

2026-08-25

Proof-of-concept exploits (1)

• KovachVL/CVE-2026-551680★ · 2026-06-16

References

• CVE Record
• NVD entry

Related

• CVE-2026-54356