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Upgrading Beyond Current Licensed Period | Confluence Data Center and Server 7.9 | Atlassian Documentation
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Atlassian Confluence OGNL Injection Remote Code Execution (RCE) Vulnerability (CVE-2022-26134) | Qualys Security Blog
GitHub - OliPelz/upgrade-confluence-wiki-v4-to-v5: a very detailed guide to updating your confluence server (with fixing a lot of upgrading errors)
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