<p>MySQL cannot read the supplied password hash because it is in an unexpected format or generated by the wrong algorithm.</p>
<p>MySQL Error 1827: ER_PASSWORD_FORMAT appears when the server receives a password hash that does not match the expected format for the chosen authentication plugin. Regenerate the hash with the correct PASSWORD() algorithm or alter the user to a supported plugin to fix the issue.</p>
The password hash doesn't have the expected format. Check
MySQL raises Error 1827 when it receives a password string that does not match the format expected by the active authentication plugin or PASSWORD() function.
The server refuses to store or compare an invalid hash, so login or user-creation statements fail until the hash format is corrected.
The error frequently appears during CREATE USER, ALTER USER, GRANT, or direct updates to the mysql.user table when the provided password was hashed using an outdated or third-party algorithm.
Upgrades from MySQL 5.x to 8.x also trigger the error if legacy hashes remain in the system tables.
Mismatch between the hash and the default authentication plugin (caching_sha2_password in MySQL 8+) is the primary trigger.
Manually copying password values between servers, using unsupported PASSWORD() syntax, or enabling old_passwords=1 can all produce incompatible hashes.
First verify the default plugin with SHOW VARIABLES LIKE 'default_authentication_plugin'.
Next, regenerate or replace each invalid password using ALTER USER ... IDENTIFIED WITH plugin BY 'plaintext'. MySQL will store the hash in the correct format.
During migrations, set old_passwords=0 and run mysql_upgrade to convert legacy hashes.
For applications hard-coded to mysql_native_password, explicitly specify that plugin when creating users to avoid format clashes.
Standardize on one authentication plugin, automate user creation scripts, and never copy hashes between major MySQL versions.
Tools like Galaxy’s modern SQL editor surface server variables in-context, helping engineers choose the correct PASSWORD() algorithm during user management tasks.
ER_NOT_SUPPORTED_AUTH_MODE and ER_MUST_CHANGE_PASSWORD are often encountered alongside ER_PASSWORD_FORMAT. They stem from plugin mismatches or expired credentials and can be resolved with the same ALTER USER approach.
Hashes generated on MySQL 4.x or 5.x servers do not match the 41-character or 94-character format required by modern plugins.
Using mysql_native_password hashes while the server default is caching_sha2_password results in a format mismatch.
Copying the value from mysql.user between servers bypasses built-in validation, leading to incompatible hash lengths.
Setting old_passwords=1 forces 16-byte hashes that newer servers reject when the value is later restored.
Raised when a client attempts to use an authentication plugin the server does not support. Fix by aligning plugin settings on both sides.
Occurs when a user with expired credentials logs in. Resolve with ALTER USER ... PASSWORD EXPIRE NEVER and a strong new password.
Generic access denial that can mask password format mismatches; verifying the plugin often uncovers ER_PASSWORD_FORMAT as the root cause.
No. MySQL blocks the invalid hash to protect your data. Fixing the hash restores normal security.
Yes. Specify IDENTIFIED WITH mysql_native_password when creating or altering the user.
Most MySQL 5.6+ clients understand new hashes. Test critical legacy apps before switching.
Galaxy surfaces server variables and offers AI-powered code completion, ensuring user management scripts always reference the correct plugin and syntax.
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