diff --git a/.azure-pipelines/ci.yml b/.azure-pipelines/ci.yml
index 1d67295b..0745716f 100644
--- a/.azure-pipelines/ci.yml
+++ b/.azure-pipelines/ci.yml
@@ -35,6 +35,9 @@ extends:
       name: 1ES_JavaTooling_Pool
       image: 1ES_JavaTooling_Ubuntu-2004
     sdl:
+      # Keep Build's CFS registry override out of Guardian's feed-scoped authentication.
+      sourceAnalysisVariablesToReset:
+        - npm_config_registry
       sourceAnalysisPool:
         name: 1ES_JavaTooling_Pool
         image: 1ES_JavaTooling_Windows_2022
diff --git a/.azure-pipelines/nightly.yml b/.azure-pipelines/nightly.yml
index d789efc3..cc87b43f 100644
--- a/.azure-pipelines/nightly.yml
+++ b/.azure-pipelines/nightly.yml
@@ -30,6 +30,10 @@ extends:
   parameters:
     pool:
       name: VSEng-MicroBuildVSStable
+    sdl:
+      # Keep Build's CFS registry override out of Guardian's feed-scoped authentication.
+      sourceAnalysisVariablesToReset:
+        - npm_config_registry
     stages:
       - stage: Build
         jobs:
diff --git a/.azure-pipelines/rc.yml b/.azure-pipelines/rc.yml
index d45dbc7e..28a0626e 100644
--- a/.azure-pipelines/rc.yml
+++ b/.azure-pipelines/rc.yml
@@ -25,6 +25,10 @@ extends:
   parameters:
     pool:
       name: VSEng-MicroBuildVSStable
+    sdl:
+      # Keep Build's CFS registry override out of Guardian's feed-scoped authentication.
+      sourceAnalysisVariablesToReset:
+        - npm_config_registry
     stages:
       - stage: Build
         jobs: