CVE-2020-26934

Vulnerability

CVE-2020-26934 is a cross-site scripting (XSS) vulnerability in phpMyAdmin's transformation feature. The flaw exists because user-supplied input is not properly sanitized before being processed by the transformation functionality, allowing an attacker to inject arbitrary JavaScript. This vulnerability was introduced in phpMyAdmin 2.5.0 and affects all versions prior to 4.9.6 and 5.0.x prior to 5.0.3 [1][4].

Exploitation

An attacker can exploit this vulnerability by crafting a malicious link that, when clicked by an authenticated phpMyAdmin user, triggers the XSS payload. The attack does not require any special privileges beyond the victim being logged into phpMyAdmin. The crafted link leverages the transformation feature to execute the injected script in the context of the victim's session [4].

Impact

Successful exploitation allows the attacker to execute arbitrary JavaScript in the victim's browser. This can lead to session hijacking, theft of sensitive data (such as database credentials displayed in the interface), or unauthorized actions performed on behalf of the victim within phpMyAdmin [1][4].

Mitigation

The vulnerability is fixed in phpMyAdmin versions 4.9.6 and 5.0.3. Users are advised to upgrade immediately or apply the patch referenced in the official advisory [4]. OpenSUSE also released a security update for affected packages [1].