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CORB error with Chrome 80 SameSite cookies


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Applicable to Theme Cosmos applications

Ensure that a mashup displays as intended by resolving the Cross-Origin Read Blocking (CORB) error with SameSite cookies in Chrome 80.


Users that use a Pega web mashup in a Chrome session with the SameSite secure cookie attribute set to None or to Strict experience the Cross-Origin Read Blocking (CORB) error.

The error message reads as follows:

Cross-Origin Read Blocking (CORB) blocked cross-origin response https://********/prweb/DGUM90lACED74DAWt5QdLQ%5B%5B*/!STANDARD?pyactivitypzZZZ=cf4bf40cc749310addc30ad4a5d8a8da8f527e446e4c7aed0d9ddacebc22fc865032be060df4542d53cc37376de8e4b46b3831dec248c3606364118229dc8a9df1271e976a2d6094f7d227f2025f4ff5aebd1374ba29b875bfeddf86e4ba0b3d3da2d045be018a9499549d3dc91494b27f576e4ecdf76e2b5c6f66ea5c20ea20c018c629bf31fe0bf97655abe161018af7c308b50cf948fdc10e597dc5da47e0ff28e2bd87514c41bffdbf70f2968ebb1c97b6997e1a2e7268aa63ccea0a8127*'' class='content-item content-field item-5 ' STRING_TYPE='field' RESERVE_SPACE='false'>


In February 2020, Google Chrome 80 implemented a secure cookie model, changing the default value of the SameSite cookie attribute from None to Lax. This change negatively affects all deployments that use Pega web mashups running on Pega Platform 7.2 to 8.4, which require the prescribed solution.


  • Apply a hotfix or upgrade to a Pega Platform Patch Release:

    1. Obtain and install the hotfixes for Pega Platform 7.2.x to 7.4, or upgrade to the designated Pega Platform 8.x Platform Patch Release.

      Pega Platform Release Hotfix or Platform Patch Release
      7.2 HFix-60723
      7.2.1 HFix-60801
      7.2.2 HFix-60346
      7.3 HFix-60724
      7.3.1 HFix-60725
      7.4 HFix-60726
      8.1.x Pega 8.1.9
      8.2.x Pega 8.2.8
      8.3.x Pega 8.3.4
      8.4.x Pega 8.4.3
      8.5.x Pega 8.5.1
    2. Create a dynamic system setting with the following properties:

      • Owning Ruleset: Pega-Engine
      • Setting Purpose: security/csrf/samesitecookieattributevalue
      • Value: none

      For more information, see Creating a dynamic system setting.

    3. For Pega Platform 8.2 and earlier releases, restart the server for the dynamic system setting to take effect.

      For Pega Platform 8.3 and later releases, when you add or update the security/csrf/samesitecookieattributevalue dynamic system setting, you do not need to restart the server or clustered servers.
    After setting the security/csrf/samesitecookieattributevalue dynamic system setting to none, use Pega web mashups only on secure (HTTPS) connections.
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