What is the ab.storage.sessionId.* cookie?
Randomly-generated string used to determine whether the user is starting a new or existing session to sync messages and calculate session analytics.
Our October 2026 scan found it on 11 sites (0% of the 2,450 we scanned), set before any consent.
- Purpose
- Analytics
- Belongs to
- Braze
- Set as
- First-party (under the site's own domain)
- Typical lifetime
- 13 months (vendor says: Session)
- Name
- A family of cookies: the part after ab.storage.sessionId. varies by site or account.
Sites that set ab.storage.sessionId.* before consent
The highest-ranked 11 of 11 sites.
- foxnews.com3 tracking companies
- xing.com3 tracking companies
- immobiliare.it6 tracking companies
- abcnews.com11 tracking companies
- getyourguide.com4 tracking companies
- fool.com4 tracking companies
- infojobs.net8 tracking companies
- asos.com5 tracking companies
- fox.com11 tracking companies
- foxsports.com9 tracking companies
Show 1 more site
- tunein.com10 tracking companies
Related cookies
Other cookies from Braze.
- ab.storage.deviceId.*11 sites
How to stop it
Declining non-essential cookies in a site's consent banner should stop ab.storage.sessionId.* 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.