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CVE-2026-73849— emlog allows unauthenticated reinstallation via `install.php?action=reinstall`.

Quick assessment

Affected
emlog emlog
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

emlog是emlog团队开源的一款轻量级博客内容管理系统。 emlog 2.6.26及之前版本存在授权问题漏洞，该漏洞源于install.php在未经验证的情况下接受action=reinstall参数并跳过已安装检查，攻击者可提交数据库配置参数覆盖config.php并创建管理员账户。

CVSS 9.8 · Critical EPSS 0.59% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
emlog emlog <= 2.6.26 affected
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I. Basic Information for CVE-2026-73849

Vulnerability Information
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Vulnerability Title
emlog allows unauthenticated reinstallation via `install.php?action=reinstall`.
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
emlog 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
emlog是emlog团队开源的一款轻量级博客内容管理系统。 emlog 2.6.26及之前版本存在授权问题漏洞，该漏洞源于install.php在未经验证的情况下接受action=reinstall参数并跳过已安装检查，攻击者可提交数据库配置参数覆盖config.php并创建管理员账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
emlog emlog <= 2.6.26 -

II. Public POCs for CVE-2026-73849

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8862 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-73849

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Vendor Advisories for CVE-2026-73849 (1)

Same Patch Batch · emlog · 2026-08-14 · 3 CVEs total

CVE-2026-73850 8.6 HIGH Emlog: Arbitrary SQL Execution Vulnerability in ai.php within queryDatabase() Function
CVE-2026-73847 6.8 MEDIUM Emlog: Missing CSRF protection in AI Assistant execute_tool leads to full database comprom

IV. Related Vulnerabilities

Same product: emlog
Same vendor: emlog
Same weakness: CWE-306

V. Comments for CVE-2026-73849

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