CVE-2026-82190 in J2Store Extension
Summary
by MITRE • 09/15/2026
Joomla Extension - j2commerce.com - Predictable/forgeable order access token in J2Store 1.0.0-3.3.2, 4.0.0-4.0.22, 4.1.0-4.1.7 - Anyone who obtains the site's Joomla `secret` can compute a valid access token for *any* order on the site without ever having placed one, gaining guest access to that order's details and any purchased digital downloads. Because the token is never rotated, this exposure persists indefinitely even after the underlying secret-disclosure vector is patched, unless the Joomla secret itself is also rotated. The attack complexity (`AC:H`) is high because it depends on the secret already being known through a separate vector; it is not directly exploitable by an anonymous visitor with no other foothold.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability identified in J2Store, specifically affecting versions 1.0.0 through 3.3.2 and 4.0.0 through 4.1.7 of the Joomla extension hosted at j2commerce.com, represents a critical failure in access control mechanisms due to predictable token generation. The core technical flaw lies in the algorithm used to generate order access tokens, which relies on cryptographic primitives that are insufficiently random or improperly seeded when combined with static site configuration data. Specifically, if an attacker obtains the Joomla secret key, they can deterministically compute a valid access token for any existing order within the system. This capability allows unauthorized entities to bypass authentication checks entirely, as the generated tokens are accepted by the application logic as legitimate credentials for accessing sensitive order information and associated digital assets without requiring prior purchase or user interaction.
The operational impact of this vulnerability is severe, particularly in e-commerce environments where customer privacy and intellectual property protection are paramount. An attacker with knowledge of the Joomla secret can access detailed personal data including names, addresses, payment details, and communication history linked to any order ID on the site. Furthermore, because J2Store facilitates the sale of digital downloads, this vulnerability enables unauthorized distribution of copyrighted software, media, or other proprietary content. The persistence of this risk is exacerbated by the fact that these access tokens are not rotated upon session expiration or after a single use. Consequently, once an attacker computes and utilizes such a token, it remains valid indefinitely unless the underlying Joomla secret key itself is changed. This creates a long-term exposure window where historical data remains vulnerable even if immediate remediation steps for other vectors are applied.
From a classification perspective, this vulnerability aligns with CWE-347 Improper Verification of Cryptographic Signature and CWE-285 Improper Authorization. The reliance on a static secret to generate access tokens without additional entropy or rotation mechanisms violates fundamental principles of secure session management defined in industry standards such as OWASP Session Management Cheat Sheet. In terms of the MITRE ATT&CK framework, this behavior facilitates unauthorized data access (T1078) and potentially credential-based attacks if the Joomla secret is obtained via phishing or other initial compromise techniques. The attack complexity is rated as high because it requires a prerequisite condition: the attacker must first possess the Joomla secret key through an independent vector such as configuration file exposure, backup leakage, or prior exploitation of another vulnerability. It does not allow for direct anonymous exploitation from the internet without this preliminary foothold.
Mitigation strategies should focus on both immediate remediation and long-term architectural improvements. Administrators running affected versions must immediately upgrade J2Store to a patched version that implements secure token generation practices, such as using cryptographically strong random number generators with sufficient entropy and implementing automatic token rotation upon use or after short time intervals. Additionally, it is critical to rotate the Joomla secret key across all installations where this extension is deployed, thereby invalidating any previously computed tokens by attackers who may have obtained the old key. Security audits should also verify that configuration files containing sensitive keys are not accessible via web servers and that backup procedures do inadvertently expose these secrets in plaintext formats. Regular monitoring for anomalous access patterns to order details can help detect exploitation attempts even after patches are applied, ensuring comprehensive protection against this class of predictable token vulnerabilities.