Vulnerability DatabaseCVE-2021-28556

CVE-2021-28556:
PHP vulnerability analysis and mitigation

Overview

A DOM-based Cross-Site Scripting (XSS) vulnerability was discovered in Magento versions 2.4.2 (and earlier), 2.4.1-p1 (and earlier), and 2.3.6-p1 (and earlier). The vulnerability specifically affects the mage-messages cookies functionality (NVD, Adobe Advisory).

Technical details

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation). It received a CVSS v3.1 base score of 6.9 (Medium) from Adobe Systems with a vector string of CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N, while NIST assigned a score of 4.8 (Medium) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N (NVD).

Impact

Successful exploitation of this vulnerability could lead to arbitrary JavaScript execution by an unauthenticated attacker. The vulnerability affects both confidentiality and integrity of the system, though user interaction is required for successful exploitation (NVD).

Mitigation and workarounds

Adobe has addressed this vulnerability in subsequent releases after versions 2.4.2, 2.4.1-p1, and 2.3.6-p1. Users are advised to update to the latest version of Magento to mitigate this vulnerability (Adobe Advisory).

Community reactions

The vulnerability was discovered and reported by security researchers Charybdis, Rutger Rademaker, and Igor Wulff from Youwe (Adobe Advisory).

Additional resources

Source: This report was generated using AI

Related PHP vulnerabilities:

CVE ID	Severity	Score	Technologies	Component name	CISA KEV exploit	Has fix	Published date
GHSA-898v-775g-777c	CRITICAL	9.4	PHP	neuron-core/neuron-ai	No	Yes	Dec 09, 2025
GHSA-5j8p-438x-rgg5	CRITICAL	9.3	PHP	onelogin/php-saml	No	Yes	Dec 09, 2025
GHSA-j8g6-5gqc-mq36	HIGH	8.2	PHP	neuron-core/neuron-ai	No	Yes	Dec 09, 2025
GHSA-pvcv-q3q7-266g	HIGH	8.1	PHP	filament/filament	No	Yes	Dec 09, 2025
GHSA-6w82-v552-wjw2	HIGH	7.1	PHP	shopware/shopware	No	Yes	Dec 09, 2025

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CVE-2021-28556: PHP vulnerability analysis and mitigation