A security bypass vulnerability exists in Magento 2.2 prior to 2.2.10, Magento 2.3 prior to 2.3.3 or 2.3.2-p1. A user with privileges to generate sitemaps can bypass configuration that restricts directory access. The bypass allows overwrite of a subset of configuration files which can lead to denial of service.

As per the Magento Release 2.3.3, if you have already implemented the pre-release version of this patch (2.3.2-p1), it is highly recommended to promptly upgrade to 2.3.2-p2.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-8133
• https://github.com/FriendsOfPHP/security-advisories/blob/master/magento/product-community-edition/CVE-2019-8133.yaml
• https://magento.com/security/patches/magento-2.3.3-and-2.2.10-security-update