What it is
A canonical that points to another domain by mistake tells Google my page is a copy of someone else's. I have seen this hand all the credit to a staging domain or a syndication partner. Canonical points to another domain by mistake.
Why does unintended cross-domain canonical matter for AI search?
Hands indexing/consolidation to a URL you may not control.
How do you fix it?
Correct to the intended on-site URL.
How do you find it on your site?
- Extract canonicals and flag any pointing to a different domain.
- Confirm whether the cross-domain target is intended, for syndication, or a mistake.
- Correct accidental cross-domain canonicals to the right on-site URL.
- Re-crawl to confirm.
Which ranking and citation factors does it touch?
An accidental cross-domain canonical can deindex your version and pass the signals to the other domain entirely. It is high impact.
What is the impact?
High if erroneous. Direct.
What is the evidence?
Cross-domain canonicals transfer the preferred-URL signal off-site. Google Search Central, Consolidate duplicate URLs (canonicalization)
Sources
Frequently asked questions about unintended cross-domain canonical
What does "Unintended cross-domain canonical" mean?
Canonical points to another domain by mistake.
How do you fix unintended cross-domain canonical?
Correct to the intended on-site URL.