Impact

Output data of the function wp_die() can be leaked under certain conditions, which can include data like nonces. It can then be used to perform actions on your behalf.

Patches

This has been patched in WordPress 5.8.1, along with any older affected versions via minor releases. It's strongly recommended that you keep auto-updates enabled to receive the fix.

References

https://wordpress.org/news/category/releases/
https://hackerone.com/reports/1142140

For more information

If you have any questions or comments about this advisory:

• Open an issue in HackerOne