CVE-2026-101105: Matrimonial System 1.0 SQL Injection Flaw

CVE-2026-101105 Overview

CVE-2026-101105 is a SQL injection vulnerability in code-projects Matrimonial System 1.0. The flaw resides in the processprofile_form function within the /create_profile endpoint of the Profile Creation component. Attackers can manipulate the fname parameter to inject arbitrary SQL statements into backend database queries. The vulnerability is exploitable remotely and requires low-level privileges. A public proof-of-concept has been disclosed, increasing the likelihood of opportunistic exploitation against exposed installations. The weakness maps to CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component.

Critical Impact
Authenticated remote attackers can inject SQL statements through the fname parameter to read, modify, or delete data in the Matrimonial System database.

Affected Products

code-projects Matrimonial System 1.0
Profile Creation Endpoint (/create_profile)
processprofile_form function processing the fname argument

Discovery Timeline

2026-09-28 - CVE-2026-101105 published to the National Vulnerability Database
2026-09-28 - Last updated in NVD database

Technical Details for CVE-2026-101105

Vulnerability Analysis

The vulnerability exists in the profile creation workflow of the Matrimonial System web application. When a user submits the profile form, the processprofile_form function receives the fname (first name) argument and passes it into a SQL query without adequate sanitization or parameterization. An authenticated attacker can supply SQL metacharacters in the fname field to break out of the intended string context and append arbitrary SQL clauses. Successful exploitation allows the attacker to read arbitrary rows from the underlying database, tamper with stored profile data, or execute database-level commands supported by the backend engine. Because the attack is delivered over HTTP, no local access to the server is required.

Root Cause

The root cause is improper neutralization of user-supplied input before its inclusion in a downstream SQL query [CWE-74]. The fname argument is concatenated into a query string rather than bound as a parameterized value, allowing SQL syntax injected by the caller to alter query semantics.

Attack Vector

Exploitation requires network access to the application and a valid low-privilege session capable of reaching /create_profile. The attacker submits a crafted HTTP request in which the fname parameter contains SQL payloads. No user interaction is required beyond the attacker's own submission. Public exploit details are hosted in the GitHub SQL Injection PoC repository referenced by VulDB CVE-2026-101105.

No verified exploit code is reproduced here. Refer to the linked PoC and advisory for reproduction steps and payload structure.

Detection Methods for CVE-2026-101105

Indicators of Compromise

HTTP POST requests to /create_profile where the fname parameter contains SQL metacharacters such as single quotes, --, UNION, SELECT, or SLEEP()
Database error messages or stack traces returned to clients following submissions to the profile creation endpoint
Anomalous read volume from the profiles table or unexpected DDL/DML activity tied to the web application service account

Detection Strategies

Deploy web application firewall (WAF) signatures that inspect the fname field of /create_profile requests for SQL injection patterns
Enable database query logging and alert on queries against the profile creation code path containing tautologies, UNION SELECT, or comment sequences
Correlate authenticated session activity with sudden spikes in query duration or row counts returned from Matrimonial System tables

Monitoring Recommendations

Forward web server, application, and database logs to a centralized analytics platform for cross-source correlation
Baseline normal /create_profile request patterns and alert on deviations in payload length, character composition, or response codes
Monitor outbound connections from the database host that could indicate post-exploitation data exfiltration

How to Mitigate CVE-2026-101105

Immediate Actions Required

Restrict access to the Matrimonial System /create_profile endpoint to trusted networks until a fix is applied
Audit application and database logs for prior exploitation attempts against the fname parameter
Rotate database credentials used by the application if compromise is suspected

Patch Information

No vendor patch is referenced in the published advisory. Consult the Code Projects Resource Hub and the VulDB Vulnerability #410978 entry for update announcements. Until an official patch is released, apply the workarounds below and treat all input to the profile creation flow as untrusted.

Workarounds

Refactor the processprofile_form function to use parameterized queries or prepared statements for the fname argument and all other user inputs
Apply server-side input validation that rejects SQL metacharacters in name fields where they are not semantically valid
Configure the application's database account with least-privilege permissions to limit the blast radius of a successful injection
Deploy a WAF rule set that blocks common SQL injection payloads targeting /create_profile

bash

# Example WAF rule concept (ModSecurity) - adapt to your environment
SecRule ARGS:fname "@rx (?i)(\bunion\b.*\bselect\b|--|/\*|\bor\b\s+1=1|\bsleep\s*\()" \
    "id:1010101,phase:2,deny,status:403,msg:'Possible SQLi in fname parameter (CVE-2026-101105)'"