Vulnerability DatabaseCVE-2021-43678

CVE-2021-43678:
PHP vulnerability analysis and mitigation

Overview

Wechat-php-sdk v1.10.2 is affected by a Cross Site Scripting (XSS) vulnerability in Wechat.php. The vulnerability was discovered in December 2021 and assigned identifier CVE-2021-43678. The issue affects the Wechat.php component of the SDK, specifically in the handling of user input (NVD).

Technical details

The vulnerability exists in the serve() method of Wechat.php, where user input from $_GET['echostr'] is processed through checkParams() and then directly output in accessAuth() without proper sanitization. The CVSS v3.1 base score is 6.1 (Medium), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N (NVD, GitHub Issue).

Impact

The vulnerability could allow an attacker to execute arbitrary web scripts or HTML in the context of the affected application. This could lead to theft of sensitive information, session hijacking, or other malicious actions performed in the context of the affected user (NVD).

Mitigation and workarounds

Users should upgrade to a version newer than v1.10.2 if available. If upgrading is not possible, implementing proper input validation and output encoding for the 'echostr' parameter is recommended (NVD).

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-2021-43678: PHP vulnerability analysis and mitigation