Provide references for CVE-2021-21266.
Where can I find more information about CVE-2021-21266?
References are available at: https://github.com/openhab/openhab-addons/security/advisories/GHSA-r2hc-pmr7-4c9r, https://dev.to/brianverm/configure-your-java-xml-parsers-to-prevent-xxe-213c, https://www.contrastsecurity.com/security-influencers/xml-xxe-pitfalls-with-jaxb, https://github.com/openhab/openhab-addons/commit/81935b0ab126e6d9aebd2f6c3fc67d82bb7e8b86.