Hi @chargeup
Did you mean to update from version 7.6.0 to 7.6.1 or 7.5.0 to 7.6.1? To clarify, we never released version 7.5.1. Instead, we jumped straight from 7.5.0 to 7.6.0.
However, if you got forced auto update from version 7.6.0 to 7.6.1 or 7.5.0 to 7.6.1, then it was indeed a security update. As @swissspidy mentioned, the latest release included a security fix (“Add nonce check to OAuth flow.”) which was also backported to older releases.
Our developer team initiated the automatic updates due to the severity of the security issue. It’s a standard procedure to protect all our users from potential risks. Our developers will likely make a public announcement once the risk has been fully mitigated and all sites have been updated. However, you can track all the changes made in our GitHub repo: https://github.com/woocommerce/woocommerce-gateway-stripe/compare/7.6.1…develop
Please note that the email you received was not malicious but rather a notification of the automatic update. We appreciate your vigilance and understanding on this matter.
I hope this clarifies your concern. If you have any other questions, feel free to ask.