CVE-2026-4540
SQL Injection in projectworlds Online Notes /login.php Remote Exploit
Publication date: 2026-03-22
Last updated on: 2026-04-29
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| projectworlds | online_notes_sharing_system | 1.0 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-89 | The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data. |
| CWE-74 | The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
[{'type': 'paragraph', 'content': "CVE-2026-4540 is a critical SQL injection vulnerability found in the Online Notes Sharing System Project version 1.0, specifically in the /login.php file. The issue arises because the 'Benutzer' (user) parameter is improperly handled and directly included in SQL queries without proper input validation or sanitization."}, {'type': 'paragraph', 'content': 'This flaw allows attackers to inject malicious SQL code remotely without any authentication, enabling unauthorized access to the database. Various SQL injection techniques such as boolean-based blind, error-based, and time-based blind injections can be used to exploit this vulnerability.'}] [1]
How can this vulnerability impact me? :
Exploitation of this vulnerability can lead to unauthorized database access, data leakage, and data tampering. Attackers may gain full control over the system, potentially disrupting services and compromising the integrity and confidentiality of stored data.
- Unauthorized access to sensitive information.
- Data leakage and exposure of confidential data.
- Data tampering or modification.
- Full system control by attackers.
- Potential service disruption.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
[{'type': 'paragraph', 'content': "This vulnerability can be detected by testing the /login.php endpoint for SQL injection vulnerabilities, specifically by manipulating the 'user' parameter with crafted payloads."}, {'type': 'list_item', 'content': "Use boolean-based blind SQL injection payloads such as: user=-8431' OR 3050=3050#"}, {'type': 'list_item', 'content': "Use error-based SQL injection payloads (for MySQL >= 5.6) such as: user=j-jcp' AND GTID_SUBSET(CONCAT(0x717a6a7a71,(SELECT (ELT(9391=9391,1))),0x716b716b71),9391)--"}, {'type': 'list_item', 'content': "Use time-based blind SQL injection payloads (for MySQL >= 5.0.12) such as: user=j-jcp' AND (SELECT 7668 FROM (SELECT(SLEEP(5)))PbmE)--"}, {'type': 'paragraph', 'content': "Automated tools like sqlmap can be used to confirm the presence and exploitability of the vulnerability by targeting the 'user' parameter on /login.php."}] [1]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include:
- Implement prepared statements with parameter binding to separate SQL code from user input, preventing injection.
- Apply strict input validation and filtering to ensure user inputs conform to expected formats.
- Minimize database user permissions by avoiding the use of high-privilege accounts (such as root or admin) for routine database operations.
- Conduct regular security audits to identify and remediate vulnerabilities promptly.