**Resolved** When use H2/MySQL/TiDB as Apache SkyWalking storage, the metadata query through GraphQL protocol, there is a SQL injection vulnerability, which allows to access unpexcted data. Apache SkyWalking 6.0.0 to 6.6.0, 7.0.0 H2/MySQL/TiDB storage implementations don't use the appropriate way to set SQL parameters.
https://github.com/tuaandatt/CVE-2020-9483---Apache-Skywalking-8.3.0
https://github.com/Neko2sh1ro/CVE-2020-9483