Hello. There are no “supported” versions of H2, you can use any version you 
wish, but you should understand that nobody cares about any previous 
releases, there will be no patch releases for them. Releases are simply 
numbered sequentially. Sometimes for some applications the latest available 
version can be not really suitable due to some regression.

H2 is not a secure container and should not be considered as it. You should 
never give ADMIN privileges to untrusted users or applications, users with 
them have the same access to your system as your JVM has (if you don't have 
a security manager with some restrictions). You should not allow untrusted 
remote connections to you server, remote connections are completely 
disabled by default, but some people enable them (sometimes even when they 
don't need them). If you use 1.4.197 and older versions you should block 
all unwanted remote connections by yourself if remote access is enabled, 
password protection of your databases is not enough. H2 1.4.198 and later 
versions are more restrictive, but some people enable old unsafe behavior  
of a server with a special flag because they depend on this behavior in 
their applications, so your system may be also vulnerable, but only due to 
its explicit unsafe configuration. It's not an issue of H2. Normally your 
database servers should not be available outside of trusted area of your 
network.

You can find some fake security issues of H2 over the internet. They are 
actually either features (administrators may legally do these things by 
design) or they are related with unsafe configuration of H2 in third-party 
projects.

There were some real issues (usually not really critical in sane 
configurations), but they weren't published.

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