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https://blog.whmcs.com/133679/security-update-2021-02-26
A security issue has been identified that affects all versions of WHMCS.
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As a result, we have published new releases for all actively supported versions of WHMCS as well as a patch which can be applied to EOL versions 7.7, 7.8 and 7.9. Patches will not be released for any earlier versions of WHMCS.
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