The planned WordPress 7.2 database change affects the connection WordPress opens, not the global MySQL configuration. Check the actual WordPress session before asking a host to change settings for every application on the server.
What is changing, and what is not yet released?
The October 9 developer note describes removing NO_BACKSLASH_ESCAPES from WordPress's session modes. As of October 16, this is preparation for 7.2, not a recommendation to install a development build on production. Keep the pre-beta staging plan separate from your live update policy.
This matters when custom database code depends on how backslashes and quotes are interpreted. A mode reported by a standalone database client does not necessarily describe the connection used by WordPress. Comparing those two readings without noting the connection can create a false diagnosis.
Capture a useful baseline
On staging, record the WordPress build, database engine/version, active database drop-in and the workflow you are testing. Use an authorized administrator shell. This read-only command asks through WordPress's own database object:
wp eval 'global $wpdb; echo $wpdb->get_var("SELECT @@SESSION.sql_mode") . PHP_EOL;'
Run it on the existing stable build and your isolated test build. Preserve the output privately. Do not put database passwords into command history, and do not replace this check with a global SET statement.
Build: Record stable and test revisions. Session: Read through the relevant connection. Data: Quotes and backslashes survive. Scope: No unplanned global changes. Explanatory checklist, not a customer test result.
Test data, not only a mode string
Create a disposable record through the application feature that normally writes it. Include an apostrophe, a literal backslash, a non-ASCII character and an ordinary value. Use synthetic examples, not a customer import.
For each field, record the submitted value, saved value, subsequent edit value and exported value. A successful save notification can hide a changed backslash or a value that no longer matches a search. Test the complete write-read-edit-export cycle, then delete only the disposable records through the application's normal controls.
If the behavior differs, trace which connection made the query. A custom integration may open its own connection with different settings. Repeating the WordPress session check will not explain a separate worker's session.
Avoid a premature compatibility override
The developer note documents an exceptional filter applied early through a db.php drop-in; normal plugins load too late. That is not an instruction to create or overwrite a database drop-in on an unfamiliar site. Hosting or caching software may already own that file.
Prefer fixing incompatible query construction and using supported parameter handling. Ask the maintainer to identify why the old behavior is required before preserving it. A change that makes one import pass but damages ordinary WordPress queries is not an acceptable release gate.
Pass criteria for the update ticket
Keep a compact record of both builds, the observed session modes, test values and results. Approve only when the business workflow preserves values and unrelated reads still work. If a mismatch remains, request a focused database compatibility investigation with a synthetic reproduction rather than a production database dump.
References reviewed October 16, 2026. Examples are explanatory, not customer test results.