CVE-2019-7881

Description

CVE-2019-7881 describes a cross-site scripting (XSS) mitigation bypass in the Magento admin panel. While the official description does not detail the specific bypass mechanism, the vulnerability allows an authenticated user with admin privileges to inject malicious JavaScript, circumventing existing XSS filters [1][2].

Exploitation

Exploitation requires an authenticated admin user with access to the admin panel. The attack surface is limited to authenticated admins, as the vulnerability is present in the admin panel itself. The attacker can inject stored XSS payloads that execute in the context of other admin users' sessions [1][2]. No known attacks in the wild are reported at the time of disclosure [1].

Impact

Successful exploitation enables an authenticated admin to escalate privileges within the admin panel by executing JavaScript in the context of another admin user (admin vs. admin XSS attack). This could lead to arbitrary actions being performed on behalf of the victim admin, such as modifying store settings, accessing sensitive data, or creating other malicious users [2]. The CVSSv3 severity is base 5.5 (Medium) [1].

Mitigation

The vulnerability is fixed in Magento 2.1.18, 2.2.9, and 2.3.2, released as part of a security update on July 30, 2019 [1][4]. Users running affected versions should upgrade immediately. No workarounds are documented; the patch is included in the bundled security update that addresses 75 critical security issues [1].