A security issue has been identified that affects versions 8.5 and 8.6 of WHMCS.

As a result, we have published new releases of WHMCS 8.5 and 8.6. All earlier versions of WHMCS are unaffected.

The issue was reported privately and there is no evidence to suggest it is known publicly. We will not be releasing any further details about the issue at this time.
 

What should I do?

You should update WHMCS, either manually or using the Automatic Updater, as soon as possible. We recommend using the Automatic Updater.

 

Mais detalhes no link abaixo:

https://blog.whmcs.com/133726/security-update-2022-11-30

Já vi gente reclamando na postagem deles sobre a forma inadequada de divulgar o problema de segurança...

Algo tipo assim "atualiza ai ou você ta ferrado" sem explicar o motivo...etc

Acho de fácil compreensão não divulgarem o motivo ou dar explicações: Algum espertinho pode explorar falhas na empresa do concorrente.

Agiram corretamente, no meu ponto de vista.