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TI-2026-39855 Aliases CVE-2026-55168

Runtipi: Authenticated arbitrary file write via backup restore symlink planting

Priority MEDIUM 64CWE-59Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00609 49th percentileScored 2026-11-07
Fix Fixed runtipi (runtipi): 4.10.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
runtipiruntipibefore 4.10.14.10.1Patch availableCNA
  • runtipi Vendorruntipi Affected before 4.10.1 Fixed in 4.10.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:runtipi:runtipi:*:*:*:*:*:*:*:*——runtipi
  • cpe:2.3:a:runtipi:runtipi:*:*:*:*:*:*:*:* Versions — — ·runtipi

Remediation

  • Fix · CNA runtipi (runtipi) Fixed in 4.10.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55168

References

Other 4

  • TI-2026-24433 Runtipi unauthenticated /api/auth/reset-password allows operator account takeover during active reset window CVSS 3.1CRITICAL 9.8
  • TI-2026-25221 Runtipi has a TOTP two-factor authentication bypass via unrestricted brute-force on `/api/auth/verify-totp` CVSS 3.1HIGH 8.8
  • TI-2026-19447 Runtipi is Vulnerable to Authenticated Arbitrary Remote Code Execution CVSS 3.1HIGH 8.8
  • TI-2026-34857 Runtipi: Unauthenticated arbitrary file read through app-store logo symlinks CVSS 3.1MEDIUM 6.5
  • TI-2026-20279 Runtipi vulnerable to unauthenticated docker-compose.yml Overwrite via Path Traversal CVSS 3.1HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences