CVE-2026-4540
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 · uneditedA vulnerability was detected in projectworlds Online Notes Sharing System 1.0. This issue affects some unknown processing of the file /login.php of the component Parameters Handler. The manipulation of the argument User results in sql injection. The attack can be executed remotely. The exploit is now public and may be used.
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 confidenceSQL injection vulnerability in the login.php page of Online Notes Sharing System 1.0, specifically in the 'User' parameter handled by the Parameters Handler component. Remote attackers can exploit this by injecting malicious SQL queries through the login form.
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
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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 checksWork through these to decide whether this CVE applies to you.
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Identify the installed versionCheck your Online Notes Sharing System version by looking at version files, about pages, or the application header/footer for a version number. Compare it to 1.0.Affected if The installed version is 1.0 or falls within an unpatched version range for this release
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Locate the login.php fileSearch the web root directory for login.php. Common paths include /login.php, /admin/login.php, or /user/login.php within the application structure.Affected if login.php exists and is accessible on the server
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Inspect the User parameter handling in login.phpOpen login.php and examine how the 'User' or 'username' parameter from the login form is processed. Look for database query construction that directly incorporates the user-supplied input.Affected if The User parameter is used directly in an SQL query without visible sanitization, parameter binding, or prepared statements
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Verify the Parameters Handler componentSearch for the Parameters Handler component in the application source code and examine how it processes the User parameter before using it in database queries.Affected if The Parameters Handler processes the User input and passes it directly to SQL execution without escaping or parameterization
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Check for SQL injection vulnerability in the login formIf you have authorization, test the login form by submitting a single quote (') in the username field. A vulnerable application may return a database error or behave unexpectedly.Affected if Submitting special SQL characters in the User field produces database errors or unexpected application behavior, indicating unsanitized input is used in queries
Your environment is affected if you are running Online Notes Sharing System version 1.0 with the login.php page accessible and the User parameter is handled by the Parameters Handler without prepared statements or input sanitization in the SQL queries.
Generated from the published advisory. Verify against your own configuration.
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 dataImplement parameterized queries (prepared statements) for all database operations in login.php, particularly for the User parameter, and validate/sanitize all user inputs before using them in SQL queries.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-4540 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-4540 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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