Did you ever figure out a fix/workaround for this?
FOS 6.2.3 is so old and so vulnerable.
"At lease" update it to 6.2.16 if your device doesn't support newer firmware.
Correct, and this is how I discovered the issue - whilst upgrading a very old FortiGate to get to latest code via the recommended upgrade path. After upgrades can no longer login because of above issue as described by OP.
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