Does POA have the right to go against a will?

A Power of Attorney (POA) generally does not have the right to go against a will. The authority of a POA typically extends to managing financial and legal matters on behalf of the principal while they are alive, but it does not extend to altering or overriding the terms of a will, which is a legal document that takes effect upon the principal's death. Any changes to a will must be made by the testator while they are alive, in accordance with legal requirements. If there are concerns about the validity of a will, those issues would need to be addressed through legal channels, such as probate court.