What is the CMPRO cookie?
Collects data on visitor behaviour from multiple websites, in order to present more relevant advertisement - This also allows the website to limit the number of times that the visitor is shown the same advertisement.
Our October 2026 scan found it on 27 sites (1% of the 2,450 we scanned), set before any consent.
- Purpose
- Advertising
- Belongs to
- Casale Media
- Set as
- Third-party (under another company's domain)
- Typical lifetime
- 3 months (vendor says: 1 day) — longer than the vendor documents
Sites that set CMPRO before consent
The highest-ranked 27 of 27 sites.
- amazon.com33 tracking companies
- datadoghq.com14 tracking companies
- amazon.co.za32 tracking companies
- usps.com24 tracking companies
- fidelity.com15 tracking companies
- amazon.com.mx34 tracking companies
- instructure.com17 tracking companies
- netkeiba.com20 tracking companies
- purdue.edu19 tracking companies
- nielsen.com10 tracking companies
Show 17 more sites
- slate.com20 tracking companies
- amazon.ae32 tracking companies
- xero.com18 tracking companies
- docusign.com9 tracking companies
- ynet.co.il23 tracking companies
- iqm.com14 tracking companies
- stuff.co.nz19 tracking companies
- acorns.com20 tracking companies
- zimperium.com8 tracking companies
- redcross.org16 tracking companies
- mainichi.jp30 tracking companies
- iq.com6 tracking companies
- estadao.com.br19 tracking companies
- amazon.sa32 tracking companies
- atlasobscura.com28 tracking companies
- sydney.edu.au11 tracking companies
- iii.com10 tracking companies
Related cookies
Other cookies from Casale Media.
How to stop it
Declining non-essential cookies in a site's consent banner should stop CMPRO being set on later visits. Blocking third-party cookies in your browser settings stops the third-party kind everywhere, and clearing cookies for a site removes any it already set.
Description from the Open Cookie Database (Apache 2.0).
Understanding this page
- How cookie lifetimes work, and why a 13-month _ga matters
What a cookie's "expires" field actually controls, why Google Analytics ships a 2-year default that many sites cut down to 13 months, and how Safari's 7-day cap on script-set cookies changes the picture.
- First-party vs third-party cookies (and why "first-party" still tracks you)
What the distinction actually means technically, why browsers only block one of the two, and how CNAME cloaking, server-side tagging and cookies like _ga let sites keep tracking under their own domain.
- How to block or limit trackers
Browser privacy settings, content blockers, Global Privacy Control and clearing cookies compared honestly — what each one actually stops, what it doesn't, and what it costs you in return.