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SQL InjectionWeakness · CWE-89

CVE-2026-39109

CRITICAL · 9.4 CVSS v3.1 Published 2026-04-20
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
SQL Injection vulnerability in Apartment Visitors Management System Apartment Visitors Management System V1.1 within the username parameter of the login page (index.php). This allows an unauthenticated attacker to manipulate backend SQL queries during authentication and retrieve sensitive database contents.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Unauthenticated SQL injection vulnerability in the username parameter of the login page (index.php) of Apartment Visitors Management System V1.1. An attacker can manipulate backend SQL queries during authentication by injecting malicious SQL syntax through the username field, potentially bypassing authentication and exfiltrating sensitive database contents.

MitigationReplace dynamic SQL query construction with parameterized queries/prepared statements for the login authentication logic. Apply input validation and ensure the database user follows least privilege principles. Deploy the vendor patch upon release.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the application software
    Check your web server for the presence of Apartment Visitors Management System by examining the application files, banner, or source code (look for 'Apartment Visitors Management System' or 'AVMS' branding in HTML source, headers, or file metadata)
    Affected if The application is not Apartment Visitors Management System or the branding is missing
  2. Confirm the installed version
    Locate the version identifier in the application - check version.php, README.txt, or the footer/header of index.php for 'V1.1' or similar version marking
    Affected if The version is V1.1 (exact match to the vulnerable version)
  3. Verify the login page is accessible
    Attempt to access index.php via HTTP/HTTPS to confirm the login page is exposed. Check if the username input field exists on the page
    Affected if index.php is reachable and contains a username input field for authentication
  4. Examine authentication code for dynamic SQL
    Inspect the server-side code in index.php (or included auth files) for the login authentication logic. Look for SQL queries built by concatenating or interpolating the username parameter directly into the query string (e.g., 'SELECT * FROM users WHERE username = ' + $username)
    Affected if The code constructs SQL queries using string concatenation/interpolation with the username parameter rather than parameterized queries
  5. Test username parameter for SQL injection response
    Send a crafted username value like admin' (with a trailing single quote) to index.php and observe the application response - look for SQL syntax errors, unusual database messages, or different behavior compared to a normal username
    Affected if The application returns SQL error messages or behaves differently when special SQL characters are injected into the username field

You are affected if the application is Apartment Visitors Management System V1.1, the login page is exposed, and the authentication code uses dynamic SQL construction with the username parameter without prepared statements.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Replace dynamic SQL query construction with parameterized queries/prepared statements for the login authentication logic. Apply input validation and ensure the database user follows least privilege principles. Deploy the vendor patch upon release.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,280
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-39109 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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