CVE-2021-42077

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

PHP Event Calendar before 2021-09-03 allows SQL injection, as demonstrated by the /server/ajax/user_manager.php username parameter. This can be used to execute SQL statements directly on the database, allowing an adversary in some cases to completely compromise the database system. It can also be used to bypass the login form.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-89

Affected software

No affected versions have been published.

Timeline

Published: Nov 8, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-420786.1PHP Event Calendar through 2021-11-04 allows persistent cross-site scripting (XSS), as demonstrated by the /server/ajax/events_manager.php t CVE-2021-420794.9An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack. This is exclusively with POST requests. CVE-2021-42087.2The ExportFeed WordPress plugin through 2.0.1.0 does not sanitise and escape the product_id POST parameter before using it in a SQL statemen CVE-2021-420807.4An attacker is able to launch a Reflected XSS attack using a crafted URL. POC: Visit the following URL https://<IPADDRESS>:8153/qstorapi/e CVE-2021-420817.2An authenticated administrator is allowed to remotely execute arbitrary shell commands via the API. POC http://<IP_ADDRESS>/qstorapi/storag CVE-2021-420827.8Local users are able to execute scripts under root privileges. POC On the local host run the following command: curl 'localhost:8154/qsto CVE-2021-420835.4An authenticated attacker is able to create alerts that trigger a stored XSS attack. POC * go to the alert manager * open the ITS CVE-2021-420846.5An issue was discovered in Zammad before 4.1.1. An attacker with valid agent credentials may send a series of crafted requests that cause an CVE-2021-420855.4An issue was discovered in Zammad before 4.1.1. There is stored XSS via a custom Avatar.CVE-2021-420868.8An issue was discovered in Zammad before 4.1.1. An Agent account can modify account data, and gain admin access, via a crafted request.CVE-2021-420874.9An issue was discovered in Zammad before 4.1.1. An admin can discover the application secret via the API.CVE-2021-420886.1An issue was discovered in Zammad before 4.1.1. The Chat functionality allows XSS because clipboard data is mishandled.