CVE-2026-55168Public exploitNetwork attack vector

Authenticated arbitrary file write via planted restore symlink

Published Aug 21, 2026 · Updated Aug 25, 2026

Link following in Runtipi 4.10.0 and earlier allows remote authenticated users to write files via a crafted backup archive. During restore, BackupManager copies an archive-supplied user-config/app.env symlink into a live path, and FilesystemService.writeTextFile() later follows it when processing attacker-controlled appEnv content. Access to the authenticated backup restore and user-config endpoints is required; successful exploitation overwrites any reachable path with Runtipi process permissions, potentially corrupting configuration or interrupting service.

CVSS severity6.5
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Link following in Runtipi 4.10.0 and earlier allows remote authenticated users to write files via a crafted backup archive. During restore, BackupManager copies an archive-supplied user-config/app.env symlink into a live path, and FilesystemService.writeTextFile() later follows it when processing attacker-controlled appEnv content. Access to the authenticated backup restore and user-config endpoints is required; successful exploitation overwrites any reachable path with Runtipi process permissions, potentially corrupting configuration or interrupting service.

The record

CVE
CVE-2026-55168
Published
Aug 21, 2026
Updated
Aug 25, 2026
Vendor
Runtipi
Product
Runtipi
Classifications
CWE-59, CWE-61, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Runtipi · Runtipiversion=< 4.10.1

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
CWE-61UNIX Symbolic Link (Symlink) Following
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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