---
id: CVE-2026-73849
title: Emlog is an open source website building system
summary: >-
  Emlog is an open source website building system. In 2.6.26 and earlier,
  install.php accepts action=reinstall without authentication and deliberately
  skips the already-installed check because the guard runs only when $act !=
  'reinstall'. …
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-306
published: '2026-08-14'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:42.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73849'
references:
  - url: 'https://github.com/emlog/emlog/security/advisories/GHSA-v5qq-p8mp-3gxm'
    label: security-advisories@github.com
  - url: 'https://github.com/emlog/emlog/security/advisories/GHSA-v5qq-p8mp-3gxm'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00726
epssPercentile: 0.52159
ingestedAt: '2026-09-16T13:56:12.589Z'
---

## Overview

Emlog is an open source website building system. In 2.6.26 and earlier, install.php accepts action=reinstall without authentication and deliberately skips the already-installed check because the guard runs only when $act != 'reinstall'. A remote attacker can submit hostname, dbuser, dbpasswd, dbname, dbprefix, username, password, and email values to cause file_put_contents('config.php', $config) to overwrite the configuration with attacker-controlled database settings and create a new administrator account. No fixed version is available as of this review.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.