Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-29456

Authelia is an open-source authentication and authorization server providing 2-factor authentication and single sign-on (SSO) for your applications via a web portal. In versions 4.27.4 and earlier, utilizing a HTTP query parameter an attacker is able to redirect users from the web application to any domain, including potentially malicious sites. This security issue does not directly impact the security of the web application itself. As a workaround, one can use a reverse proxy to strip the query parameter from the affected endpoint. There is a patch for version 4.28.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 36.5%
CVSS Severity
CVSS v3 Score 5.7
CVSS v2 Score 4.9
Products affected by CVE-2021-29456


Contact Us

Shodan ® - All rights reserved