Apostrophe in last name when adding user causes erroneous 403 error

[ebonweaver]

If you try to create a user with a last name that has an apostrophe (e.g. O'Conner) you get a 403 Forbidden when trying to add the user. Based on searches, this bug has been around for 14 years, but I see no evidence it's ever been reported. Unclear why that character in a user last name would cause such an erroneous security error.

[clarkenriquez]

I've tried replicating this error (adding both first name and last name with the name O'Conner) but it seems it's just working well on my end, maybe you meant another kind of special character for this?

[SergeyBiryukov]

Hi there, welcome to WordPress Trac! Thanks for the report.

Just noting that I also could not reproduce the issue on a clean install. This sounds like an issue triggered by a plugin or some overzealous security rule on the server.

Some similar issues: #25564, #25736, #32571, #33160, #44861, #45368, #48673, #48698, #49766, #53683.