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CVE-2026-73849 – Unauthenticated Reinstallation/Admin Takeover – Emlog Pro ≤ 2.6.26

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Summary

CVE-2026-73849 is a critical missing-authentication vulnerability (CWE-306) in emlog, an open-source website building system. The install.php script accepts an action=reinstall request without requiring authentication, allowing a remote attacker to overwrite the application’s database configuration and create a new administrator account. The flaw carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: install.php guards its "already installed" check with a condition that only runs when $act != 'reinstall'. Setting action=reinstall bypasses this check entirely, letting the installation logic execute even on an already-configured site.
  • Trigger conditions: An unauthenticated remote request to install.php?action=reinstall supplying parameters such as hostname, dbuser, dbpasswd, dbname, dbprefix, username, password, and email.
  • Attack vector: Network-based, no privileges and no user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: The submitted values are written via file_put_contents('config.php', $config), overwriting the site’s live database configuration with attacker-controlled settings and simultaneously creating a new administrator account — resulting in full compromise of confidentiality, integrity, and availability.

Affected software

  • emlog (emlog/emlog): versions 2.6.26 and earlier

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No fixed version is available as of this review. Monitor the vendor’s GitHub Security Advisory (GHSA-v5qq-p8mp-3gxm) for a patch release and upgrade as soon as one is published.
  • If no patch is available:
    • Restrict or block external access to install.php at the web server or reverse proxy layer (e.g., deny requests containing action=reinstall).
    • Remove or rename the install.php file/directory on production deployments where reinstallation is not needed.
    • Monitor web server and application logs for unexpected POST requests to install.php with database-credential parameters.
    • Rotate database credentials and review admin account lists if exposure to the internet cannot be ruled out.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw response body: powered by emlog, powered by <a href="https://www.emlog.net">emlog</a>
  • Page title: powered by emlog

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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