CVE-2026-11483: SQL Injection in SourceCodester System

Detection and triage guidance

Start by identifying whether SourceCodester Class and Exam Timetabling System 1.0 is deployed anywhere in your environment. Asset inventories, web server root scans, PHP application listings, and configuration management data can all help. If you find the application, verify whether /archive4.php is reachable and whether the sy parameter is passed in GET or POST requests in normal application usage.

Next, inspect web server logs for suspicious requests targeting archive4.php, especially where the sy parameter contains SQL metacharacters, boolean conditions, UNION-based probes, or time-delay functions. Because the exact PoC body was not recoverable from the referenced GitHub issue during research, defenders should look for broad SQLi indicators rather than a single fixed payload.

In parallel, check database logs for query errors or anomalous long-running statements associated with the application user. SQL injection often leaves traces such as syntax errors, quote-balancing failures, or execution of database functions that do not match normal application behavior. Even where attackers use blind SQLi techniques, repeated requests with only minor parameter variations can be a strong signal.

Prioritize triage if you observe any of the following: repeated requests to /archive4.php from unfamiliar IPs, parameter values containing ', ", --, /*, UNION, SELECT, SLEEP(, BENCHMARK(, or URL-encoded equivalents, or correlated database errors at the same timestamps. Also review WAF alerts if present, but do not assume absence of alerts means absence of exploitation.

Technical Notes

Example Apache or Nginx access log grep for suspicious sy values:

grep -Ei 'archive4\.php.*sy=.*(%27|%22|%2D%2D|%23|union|select|sleep\(|benchmark\(|or%201=1|and%201=1)' /var/log/apache2/access.log /var/log/nginx/access.log

Example log patterns to hunt for:

GET /archive4.php?sy=2026%27%20OR%201=1-- HTTP/1.1
GET /archive4.php?sy=2026%20UNION%20SELECT%20... HTTP/1.1
GET /archive4.php?sy=2026%27%20AND%20SLEEP(5)-- HTTP/1.1

Example Splunk search:

index=web (uri_path="/archive4.php" OR uri="/archive4.php*")
| eval sy=coalesce(uri_query, request)
| search sy="*union*" OR sy="*select*" OR sy="*sleep(*" OR sy="*benchmark(*" OR sy="*--*" OR sy="*' *"
| stats count min(_time) as first_seen max(_time) as last_seen by src_ip, http_method, uri, status, user_agent
| sort - count

Example Sigma-style detection idea for reverse proxy logs:

title: Suspicious SQLi Probes Against archive4.php sy Parameter
logsource:
  category: webserver
detection:
  selection:
    cs-uri-stem: "/archive4.php"
  keywords:
    cs-uri-query|contains:
      - "sy="
      - "union"
      - "select"
      - "sleep("
      - "benchmark("
      - "--"
      - "%27"
  condition: selection and keywords
level: high

Mitigation and remediation

Because there is no verified fixed version number, the first mitigation step is exposure reduction. If the application does not need to be public, remove it from internet access immediately. Restrict access with network ACLs, VPN-only access, reverse proxy allowlists, or administrative jump hosts. This is the fastest way to cut risk while you assess code-level remediation.

If the application must remain accessible, implement virtual patching in front of the vulnerable endpoint. A WAF or reverse proxy rule should block or challenge requests to /archive4.php where the sy parameter contains SQL metacharacters or common SQLi keywords. This is not a perfect substitute for a code fix, but it materially reduces commodity exploitation attempts and buys time for source review.

At the application layer, review archive4.php for dynamic SQL construction involving $_GET['sy'], $_POST['sy'], or any derived variable. Replace string concatenation with parameterized queries/prepared statements. If sy is expected to be a year or school-year token, enforce strict server-side validation such as an allowlist or integer-only coercion before the value reaches any query logic.

Also evaluate the database account used by the application. Even if SQL injection remains reachable, least-privilege permissions can reduce impact. The application database user should not have unnecessary DROP, ALTER, FILE, administrative, or cross-database privileges. Review credential reuse as well, because hard-coded database credentials in PHP apps are often shared across multiple local projects.

Technical Notes

If you manage the code locally, search for vulnerable patterns first:

grep -RniE "archive4\.php|\$_GET\['sy'\]|\$_REQUEST\['sy'\]|\$_POST\['sy'\]" /var/www/html/

A vulnerable pattern may look like this:

$sy = $_GET['sy'];
$sql = "SELECT * FROM schedules WHERE sy = '$sy'";
$result = mysqli_query($conn, $sql);

A safer pattern uses parameterized queries:

$sy = $_GET['sy'] ?? '';
$stmt = $conn->prepare("SELECT * FROM schedules WHERE sy = ?");
$stmt->bind_param("s", $sy);
$stmt->execute();
$result = $stmt->get_result();

If sy should be numeric, enforce it before query execution:

$sy = filter_input(INPUT_GET, 'sy', FILTER_VALIDATE_INT);
if ($sy === false || $sy === null) {
    http_response_code(400);
    exit('Invalid sy value');
}

Example ModSecurity-style virtual patch:

SecRule REQUEST_URI "@beginsWith /archive4.php" \
  "id:1148301,phase:2,deny,status:403,msg:'Blocked suspected SQLi on archive4.php sy',chain"
SecRule ARGS:sy "@rx (?i:(union|select|sleep\(|benchmark\(|--|#|/\*|%27|%22|or\s+1=1|and\s+1=1))"

Example operational workaround to remove exposure at the web tier:

# Apache: temporarily block direct access to archive4.php
printf '\n<Files "archive4.php">\n  Require all denied\n</Files>\n' | sudo tee -a /etc/apache2/apache2.conf
sudo apachectl configtest && sudo systemctl reload apache2

# Nginx: temporarily block the vulnerable endpoint
cat <<'EOF' | sudo tee /etc/nginx/snippets/block-archive4.conf
location = /archive4.php { deny all; return 403; }
EOF
sudo nginx -t && sudo systemctl reload nginx

There is no verified vendor-provided package upgrade command to cite because no confirmed fixed release exists in the currently available sources. If you later obtain a trusted patched release from a maintainer, document the exact version and deployment command internally before rollout.

References

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