CVE-2026-55477Public exploitNetwork attack vector

Authenticated file write via unrestricted Xray log paths

Published Jun 25, 2026 · Updated Jun 25, 2026

Arbitrary file write in MHSanaei 3x-ui before 3.3.1 allows remote authenticated users to modify host files through Xray logging. The Xray configuration generator accepts attacker-controlled log.access or log.error paths from imported database or raw configuration data, while client email content is written into the selected log file. Panel administrator access is required; writable targets can yield persistent code execution with the Xray service account's privileges, including root.

CVSS severity7.2
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in MHSanaei 3x-ui before 3.3.1 allows remote authenticated users to modify host files through Xray logging. The Xray configuration generator accepts attacker-controlled log.access or log.error paths from imported database or raw configuration data, while client email content is written into the selected log file. Panel administrator access is required; writable targets can yield persistent code execution with the Xray service account's privileges, including root.

The record

CVE
CVE-2026-55477
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
MHSanaei
Product
3x-ui
Classifications
CWE-73, T1098.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 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=< 3.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

MHSanaei · 3x-uiversion=< 3.3.1

Published CVSS scores

7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
T1098.004Account Manipulation: SSH Authorized Keys

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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