CVE-2026-55168
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.
What this means for your business
- An attacker can use it remotely, over a network, with an administrator login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.5% chance of attack attempts being seen in the next 30 days, ranking above 43% of all known flaws.
What to do
- 1Ask your IT team or provider whether any of your systems use the affected product.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
Not sure if your company is exposed?
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Scoring
- CVSS
- 6.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H- Weakness
- CWE-59
- Assigned by
- security-advisories@github.com
Dates
- Published
- 2026-08-21
- Last modified
- 2026-08-25
- Sources
- NVD
References
- https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c
- https://github.com/runtipi/runtipi/pull/2606
- https://github.com/runtipi/runtipi/releases/tag/v4.10.1
- https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7
- https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7