CVE-2026-31888

Shopware is an open commerce platform. Prior to 6.7.8.1 and 6.6.10.15, the Store API login endpoint (POST /store-api/account/login) returns different error codes depending on whether the submitted email address belongs to a registered customer (CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS) or is unknown (CHECKOUT__CUSTOMER_NOT_FOUND). The "not found" response also echoes the probed email address. This allows an unauthenticated attacker to enumerate valid customer accounts. The storefront login controller correctly unifies both error paths, but the Store API does not — indicating an inconsistent defense. This vulnerability is fixed in 6.7.8.1 and 6.6.10.15.

Shopware is an open commerce platform. Prior to 6.7.8.1 and 6.6.10.15, the Store API login endpoint (POST /store-api/account/login) returns different error codes depending on whether the submitted email address belongs to a registered customer (CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS) or is unknown (CHECKOUT__CUSTOMER_NOT_FOUND). The "not found" response also echoes the probed email address. This allows an unauthenticated attacker to enumerate valid customer accounts. The storefront login controller correctly unifies both error paths, but the Store API does not — indicating an inconsistent defense. This vulnerability is fixed in 6.7.8.1 and 6.6.10.15.

Summary

The Store API login endpoint (POST /store-api/account/login) returns different error codes depending on whether the submitted email address belongs to a registered customer (CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS) or is unknown (CHECKOUT__CUSTOMER_NOT_FOUND). The "not found" response also echoes the probed email address. This allows an unauthenticated attacker to enumerate valid customer accounts. The storefront login controller correctly unifies both error paths, but the Store API does not — indicating an inconsistent defense.

CWE

• CWE-204: Observable Response Discrepancy

Description

Distinct error codes leak account existence

The login flow in AccountService::getCustomerByLogin() calls getCustomerByEmail() first, which throws CustomerNotFoundException if the email is not found. If the email IS found but the password is wrong, a separate BadCredentialsException is thrown:

// src/Core/Checkout/Customer/SalesChannel/AccountService.php:116-145
public function getCustomerByLogin(string $email, string $password, SalesChannelContext $context): CustomerEntity
{
    if ($this->isPasswordTooLong($password)) {
        throw CustomerException::badCredentials();
    }

    $customer = $this->getCustomerByEmail($email, $context);
    // ↑ Throws CustomerNotFoundException with CHECKOUT__CUSTOMER_NOT_FOUND if email unknown

    if ($customer->hasLegacyPassword()) {
        if (!$this->legacyPasswordVerifier->verify($password, $customer)) {
            throw CustomerException::badCredentials();
            // ↑ Throws BadCredentialsException with CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS
        }
        // ...
    }

    if ($customer->getPassword() === null
        || !password_verify($password, $customer->getPassword())) {
        throw CustomerException::badCredentials();
        // ↑ Same: CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS
    }
    // ...
}

The two exception types produce clearly distinguishable API responses:

Email not registered:

{
  "errors": [{
    "status": "401",
    "code": "CHECKOUT__CUSTOMER_NOT_FOUND",
    "detail": "No matching customer for the email \"[email protected]\" was found.",
    "meta": { "parameters": { "email": "[email protected]" } }
  }]
}

Email registered, wrong password:

{
  "errors": [{
    "status": "401",
    "code": "CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS",
    "detail": "Invalid username and/or password."
  }]
}

Storefront is protected — Store API is not

The storefront login controller demonstrates that Shopware's developers are aware of this risk class. AuthController::login() catches both exceptions together and returns a generic error:

// src/Storefront/Controller/AuthController.php:203
} catch (BadCredentialsException|CustomerNotFoundException) {
    // Unified handling — no distinction exposed to the user
}

The Store API LoginRoute::login() does NOT catch these exceptions. They propagate to the global ErrorResponseFactory, which serializes the distinct error codes into the JSON response:

// src/Core/Checkout/Customer/SalesChannel/LoginRoute.php:54-58
$token = $this->accountService->loginByCredentials(
    $email,
    (string) $data->get('password'),
    $context
);
// No try/catch — exceptions propagate with distinct codes

This inconsistency confirms the Store API exposure is an oversight, not a design decision.

Rate limiting is present but insufficient for enumeration

The login route has rate limiting (LoginRoute.php:47-51) keyed on strtolower($email) . '-' . $clientIp. This slows bulk enumeration but does not prevent it because:

1. The attacker only needs one request per email to determine existence
2. The rate limit key includes the IP, so rotating IPs resets the counter
3. The rate limiter is designed to prevent brute-force password guessing, not single-probe enumeration

Impact

• Customer email enumeration: An attacker can…

Shopware is an open commerce platform. Prior to 6.7.8.1 and 6.6.10.15, the Store API login endpoint (POST /store-api/account/login) returns different error codes depending on whether the submitted email address belongs to a registered customer (CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS) or is unknown (CHECKOUT__CUSTOMER_NOT_FOUND). The "not found" response also echoes the probed email address. This allows an unauthenticated attacker to enumerate valid customer accounts. The storefront login controller correctly unifies both error paths, but the Store API does not — indicating an inconsistent defense. This vulnerability is fixed in 6.7.8.1 and 6.6.10.15.

Shopware is an open commerce platform. Prior to 6.7.8.1 and 6.6.10.15, the Store API login endpoint (POST /store-api/account/login) returns different error codes depending on whether the submitted email address belongs to a registered customer (CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS) or is unknown (CHECKOUT__CUSTOMER_NOT_FOUND). The "not found" response also echoes the probed email address. This allows an unauthenticated attacker to enumerate valid customer accounts. The storefront login controller correctly unifies both error paths, but the Store API does not — indicating an inconsistent defense. This vulnerability is fixed in 6.7.8.1 and 6.6.10.15.

Summary

The Store API login endpoint (POST /store-api/account/login) returns different error codes depending on whether the submitted email address belongs to a registered customer (CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS) or is unknown (CHECKOUT__CUSTOMER_NOT_FOUND). The "not found" response also echoes the probed email address. This allows an unauthenticated attacker to enumerate valid customer accounts. The storefront login controller correctly unifies both error paths, but the Store API does not — indicating an inconsistent defense.

CWE

• CWE-204: Observable Response Discrepancy

Description

Distinct error codes leak account existence

The login flow in AccountService::getCustomerByLogin() calls getCustomerByEmail() first, which throws CustomerNotFoundException if the email is not found. If the email IS found but the password is wrong, a separate BadCredentialsException is thrown:

// src/Core/Checkout/Customer/SalesChannel/AccountService.php:116-145
public function getCustomerByLogin(string $email, string $password, SalesChannelContext $context): CustomerEntity
{
    if ($this->isPasswordTooLong($password)) {
        throw CustomerException::badCredentials();
    }

    $customer = $this->getCustomerByEmail($email, $context);
    // ↑ Throws CustomerNotFoundException with CHECKOUT__CUSTOMER_NOT_FOUND if email unknown

    if ($customer->hasLegacyPassword()) {
        if (!$this->legacyPasswordVerifier->verify($password, $customer)) {
            throw CustomerException::badCredentials();
            // ↑ Throws BadCredentialsException with CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS
        }
        // ...
    }

    if ($customer->getPassword() === null
        || !password_verify($password, $customer->getPassword())) {
        throw CustomerException::badCredentials();
        // ↑ Same: CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS
    }
    // ...
}

The two exception types produce clearly distinguishable API responses:

Email not registered:

{
  "errors": [{
    "status": "401",
    "code": "CHECKOUT__CUSTOMER_NOT_FOUND",
    "detail": "No matching customer for the email \"[email protected]\" was found.",
    "meta": { "parameters": { "email": "[email protected]" } }
  }]
}

Email registered, wrong password:

{
  "errors": [{
    "status": "401",
    "code": "CHECKOUT__CUSTOMER_AUTH_BAD_CREDENTIALS",
    "detail": "Invalid username and/or password."
  }]
}

Storefront is protected — Store API is not

The storefront login controller demonstrates that Shopware's developers are aware of this risk class. AuthController::login() catches both exceptions together and returns a generic error:

// src/Storefront/Controller/AuthController.php:203
} catch (BadCredentialsException|CustomerNotFoundException) {
    // Unified handling — no distinction exposed to the user
}

The Store API LoginRoute::login() does NOT catch these exceptions. They propagate to the global ErrorResponseFactory, which serializes the distinct error codes into the JSON response:

// src/Core/Checkout/Customer/SalesChannel/LoginRoute.php:54-58
$token = $this->accountService->loginByCredentials(
    $email,
    (string) $data->get('password'),
    $context
);
// No try/catch — exceptions propagate with distinct codes

This inconsistency confirms the Store API exposure is an oversight, not a design decision.

Rate limiting is present but insufficient for enumeration

The login route has rate limiting (LoginRoute.php:47-51) keyed on strtolower($email) . '-' . $clientIp. This slows bulk enumeration but does not prevent it because:

1. The attacker only needs one request per email to determine existence
2. The rate limit key includes the IP, so rotating IPs resets the counter
3. The rate limiter is designed to prevent brute-force password guessing, not single-probe enumeration

Impact

• Customer email enumeration: An attacker can…