Safari 27.2 Removes Unintended 7-Day Cookie Limit for CNAME-Hosted Sites
· 53m ago · Originally reported by PPC Land
Apple's Safari browser version 27.2 has corrected an issue where cookies set by sites using CNAME records expired after seven days. This change affects sites that use CNAME-based subdomains for tracking or analytics, restoring normal cookie lifespans.
Why it matters
This fix is important because many advertisers and publishers rely on CNAME-based tracking to maintain user data and ad measurement. The previous limitation disrupted accurate tracking and campaign performance.
Explain it like I’m new here
It's like fixing a rule that made some websites forget who you are after a week, even though they shouldn't have.
Terms in this story
Reach
Reach is the number (or percentage) of unique people or households who saw an ad at least once during a campaign, as opposed to the total number of impressions.
Conversions API (server-side tracking)
A conversions API sends conversion events, such as purchases or sign-ups, directly from an advertiser's server to an ad platform, instead of relying only on browser pixels.
Go deeper
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