Runtipi up to 4.10.0 Backup Restore user-config/app.env FilesystemService.writeTextFile symlink

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.70

Summaryinfo

A vulnerability classified as problematic was found in Runtipi up to 4.10.0. This affects the function FilesystemService.writeTextFile of the file user-config/app.env of the component Backup Restore. Such manipulation leads to symlink. This vulnerability is documented as CVE-2026-55168. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Runtipi up to 4.10.0. It has been rated as problematic. Affected by this issue is the function FilesystemService.writeTextFile of the file user-config/app.env of the component Backup Restore. The manipulation with an unknown input leads to a symlink vulnerability. Using CWE to declare the problem leads to CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. Impacted is integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-55168 since 06/16/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

Upgrading to version 4.10.1 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.8
VulDB Temp Score: 3.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Symlink
CWE: CWE-61 / CWE-59
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Runtipi 4.10.1

Timelineinfo

06/16/2026 CVE reserved
08/21/2026 +66 days Advisory disclosed
08/21/2026 +0 days VulDB entry created
08/21/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-55168 (🔒)
GCVE (CVE): GCVE-0-2026-55168
GCVE (VulDB): GCVE-100-394226

Entryinfo

Created: 08/21/2026 23:09
Changes: 08/21/2026 23:09 (65)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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