Runtipi: Authenticated arbitrary file write via backup restore symlink planting

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55168
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-21 21:17:00 UTC
Updated2026-08-21 21:17:00 UTC
DescriptionRuntipi 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-59 | CWE-61 | CWE-59 CWE-59: Improper Link Resolution Before File Access ('Link Following') | CWE-61 CWE-61: UNIX Symbolic Link (Symlink) Following

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Runtipi Runtipi affected < 4.10.1 Not specified

References

ReferenceSourceLinkTags
github.com/runtipi/runtipi/releases/tag/v4.10.1 [email protected] github.com
github.com/runtipi/runtipi/pull/2606 [email protected] github.com
github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7 [email protected] github.com
github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c [email protected] github.com
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