What’s Vulnerable › Vulnerabilities

CVE-2026-55168: Runtipi: Authenticated arbitrary file write via backup restore symlink planting

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-21 · updated 2026-10-14
• Weakness: CWE-59

Description

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 products

• runtipi: before 4.10.1

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

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