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EUVD-2026-319024

fkie_cve-2026-42155

Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to 20.18.0, the XML-RPC / SOAP API session ID is generated using an outdated, time-based construction rather than a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG). All inputs to the MD5 hash are time-derived and non-secure. Because the resulting digest relies entirely on the timestamp and the PHP internal LCG state, the effective entropy is severely constrained. This violates the OWASP ASVS v4 requirement of ≥ 64 bits of entropy (V3.2.2) and NIST SP 800-63B standards. By narrowing the LCG window (via server state leaks or general predictability) and leveraging the lack of API rate-limiting, an attacker can generate a localized pool of candidate MD5 hashes and execute a high-speed online brute-force attack to hijack active API sessions. This vulnerability is fixed in 20.18.0.

GHSA-2cwr-gcf9-pvxr — Magento LTS has Weak API Session ID — Predictable MD5 of Time-Derived Inputs

Affected: Packagist: openmage/magento-lts

Affected Version: OpenMage LTS ≤ 20.16.0 (confirmed on `20.16.0`)

Affected File: `https://github.com/OpenMage/magento-lts/blob/main/app/code/core/Mage/Api/Model/Session.php` – `start()` method

## Summary

The XML-RPC / SOAP API session ID is generated using an outdated, time-based construction rather than a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG):

```php The XML-RPC / SOAP API session ID is generated using an outdated, time-based construction rather than a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG): ``` All inputs to the MD5 hash are time-derived and non-secure:

| Input | Value | Predictability | |----------------------------|---------------------------------------------------|----------------------------------------| | `time()` | Unix timestamp (seconds) | Fully predictable | | `uniqid('', true) prefix` | `sprintf('%08x%05x', $sec, $usec/10)` | Highly predictable via network timing | | `uniqid('', true) suffix` | `php_combined_lcg()` decimal float | Process-state dependent (`getpid() ^ time()`) | | `$sessionName` | `null` (empty) — called without arg | Constant |

Because the resulting digest relies entirely on the timestamp and the PHP internal LCG state, the effective entropy is severel…