Runtipi: Authenticated arbitrary file write via backup restore symlink planting
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.5epss 0.5%
from disclosure to weapon0 days
Published on NVDAug 21
1st PoCJun 16
exploitation probability
0.5%top 58% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Affected products
runtipi · runtipipublic PoCs found — 1
githubgithub.com/KovachVL/CVE-2026-55168★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.