To mitigate, all users using this plugin are urged to update immediately.
LNbank plugin is also being phased out in 1.9.2.
More information https://d11n.net/one-more-lnbank-vulnerability.html
This security vulnerability only affects users using LNbank plugin, if you don't have it enabled ,you're safe and no further actions are needed.
There's a support channel for all LNbank users on http://chat.btcpayserver.org if you require assistance, join there.
quoting🚨 One more #LNbank vulnerability: Please immediately upgrade to v1.9.2, which fixes another critical vulnerability.
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This will be the last version of LNbank and everyone using the plugin should phase out its usage. LNbank v1.9.2 completly disables the sending functionality. I advise you to phase out the usage of LNbank and pay out your users manually.
More information and guidance here: https://d11n.net/one-more-lnbank-vulnerability.html