SR-D90524 · Issue 549048
SameSite cookie setting added for Mashup support in Google Chrome v80+
Resolved in Pega Version 8.4.1
The Google Chrome browser version 80 and above now treats SameSite with a blank value as "Lax" by default, causing mashup scenarios to break. In order to compensate for this change, support has been added for setting SameSite=None in Cookie Settings; this value automatically includes the “secure” cookie flag, which enforces HTTPS for the Pega server and mashup. For mashups to work, SameSite should be set as None. Create a Dynamic system setting in the Pega-Engine RuleSet with the name “security/csrf/samesitecookieattributevalue” and the value "None" and restart the server. (The SameSite value "None" works only in secure HTTPS connections.) Note: The SameSite cookie may be set to None/Lax/Strict, based on the requirement. For cookie requirements other than mashup, it should be set as either Strict or Lax, depending upon your application.