Description
Contao is an Open Source CMS. In affected versions an untrusted user can inject insert tags into the canonical tag, which are then replaced on the web page (front end). Users are advised to update to Contao 4.13.49, 5.3.15 or 5.4.3. Users unable to upgrade should disable canonical tags in the root page settings.
Remediation
References
Related Vulnerabilities
IBM WebSEAL Use of Hard-coded Credentials Vulnerability (CVE-2018-1887)
Moodle Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2015-5340)
WordPress Plugin WordPress Survey & Poll-Quiz, Survey and Poll SQL Injection (1.1.91)
WordPress Plugin WordPress Simple Shopping Cart Cross-Site Scripting (4.6.1)