diff --git a/.github/workflows/create-release.yaml b/.github/workflows/create-release.yaml
index b597a404..cc51a221 100644
--- a/.github/workflows/create-release.yaml
+++ b/.github/workflows/create-release.yaml
@@ -156,6 +156,17 @@ jobs:
             ./utils/render_catalog.sh
           done
 
+      - name: Validate updated catalog sources
+        env:
+          FBC_DIR: ${{ github.event.inputs.fbc_dir }}
+          VERSIONS: ${{ github.event.inputs.ocp_versions }}
+        run: |
+          IFS=',' read -ra versions <<< "${VERSIONS}"
+          for version in "${versions[@]}"; do
+            version="${version//[[:space:]]/}"
+            ./utils/validate_fbc_graph_sync.sh "${version}/${FBC_DIR}"
+          done
+
       - name: Stage catalog changes
         run: git add .
 
diff --git a/.github/workflows/sync-catalog.yaml b/.github/workflows/sync-catalog.yaml
index bafd8015..b3a290eb 100644
--- a/.github/workflows/sync-catalog.yaml
+++ b/.github/workflows/sync-catalog.yaml
@@ -65,8 +65,7 @@ jobs:
             yq eval -i 'del(.entries[] | select(.schema == "io.openshift.operators.lifecycles.v1alpha1"))' $OCP_VERSION/$PACKAGE_NAME/graph.yaml
             FBC_DIR=$PACKAGE_NAME CATALOG_FILE="$OCP_VERSION/$PACKAGE_NAME/catalog/$PACKAGE_NAME/catalog.json" ./utils/render_catalog.sh
 
-            echo "Validating ${{ matrix.ocp_version }}/$PACKAGE_NAME/catalog/$PACKAGE_NAME"
-            opm validate ${{ matrix.ocp_version }}/$PACKAGE_NAME/catalog/$PACKAGE_NAME/
+            ./utils/validate_fbc_graph_sync.sh "${OCP_VERSION}/${PACKAGE_NAME}"
           done
       # FIX 1: Tar the output to preserve directory structure
       - name: Compress Artifacts
diff --git a/.github/workflows/validate-fbc-catalogs.yaml b/.github/workflows/validate-fbc-catalogs.yaml
new file mode 100644
index 00000000..11ac1424
--- /dev/null
+++ b/.github/workflows/validate-fbc-catalogs.yaml
@@ -0,0 +1,41 @@
+name: FBC source validation
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+      - 'release-*'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: fbc-source-validation-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  validate:
+    name: Validate changed FBC catalogs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+
+      - name: Install OPM
+        uses: ./.github/actions/install-opm
+
+      - name: Validate catalog sources
+        env:
+          BASE_SHA: ${{ github.event.pull_request.base.sha || github.event.before }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
+        run: |
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" || -z "${BASE_SHA}" ]]; then
+            ./utils/validate_changed_fbc_catalogs.sh --all
+          else
+            ./utils/validate_changed_fbc_catalogs.sh "${BASE_SHA}" "${HEAD_SHA}"
+          fi
diff --git a/README.md b/README.md
index 941e77c3..b44fe0e0 100644
--- a/README.md
+++ b/README.md
@@ -26,8 +26,8 @@ Releases in this repository follow a snapshot-based workflow. First, candidate r
 
 ## Validating a Catalog Locally
 
-Run the same graph and catalog validation used by the FBC builder pipeline by
-passing the catalog context to the validation script:
+Run the same graph and catalog validation used by repository CI by passing the
+catalog context to the validation script:
 
 ```bash
 ./utils/validate_fbc_graph_sync.sh v4.20/rhtas-operator
@@ -35,3 +35,14 @@ passing the catalog context to the validation script:
 
 The script requires `opm` and `jq`. It validates both the committed catalog
 and its synchronization with `graph.yaml`.
+
+GitHub Actions runs the `Validate changed FBC catalogs` check for every pull
+request and for every commit pushed to `main` or a `release-*` branch. Changes
+to validation tooling cause all catalogs to be checked; otherwise only changed
+catalog contexts are validated.
+
+The release-creation and nightly synchronization workflows run this validation
+before creating their signed commits. This prevents invalid automated catalog
+content from being pushed and triggering a Konflux snapshot. A Release CR must
+only reference a snapshot whose source commit has a successful `Validate changed
+FBC catalogs` check.
diff --git a/utils/validate_changed_fbc_catalogs.sh b/utils/validate_changed_fbc_catalogs.sh
new file mode 100755
index 00000000..f0f2d786
--- /dev/null
+++ b/utils/validate_changed_fbc_catalogs.sh
@@ -0,0 +1,89 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo_root="$(cd "${script_dir}/.." && pwd)"
+cd "${repo_root}"
+
+usage() {
+    echo "Usage: $0 --all | <base-revision> [head-revision]" >&2
+}
+
+all_contexts() {
+    find . -mindepth 3 -maxdepth 3 -type f -name graph.yaml -path './v*/*/graph.yaml' \
+        | sed -e 's#^\./##' -e 's#/graph.yaml$##' \
+        | sort -u
+}
+
+if [[ $# -eq 1 && "$1" == "--all" ]]; then
+    mapfile -t contexts < <(all_contexts)
+elif [[ $# -ge 1 && $# -le 2 ]]; then
+    base_revision="$1"
+    head_revision="${2:-HEAD}"
+
+    if ! git cat-file -e "${head_revision}^{commit}" 2>/dev/null; then
+        echo "Head revision ${head_revision} does not resolve to a commit." >&2
+        exit 2
+    fi
+
+    if [[ "${base_revision}" =~ ^0+$ ]] || ! git cat-file -e "${base_revision}^{commit}" 2>/dev/null; then
+        echo "Base revision is unavailable; validating all catalogs."
+        mapfile -t contexts < <(all_contexts)
+    else
+        changed_files="$(
+            git diff --name-status --find-renames --find-copies --diff-filter=ACDMRT \
+                "${base_revision}" "${head_revision}" \
+                | awk -F '\t' '
+                    $1 ~ /^[RC]/ {
+                        print $2
+                        print $3
+                        next
+                    }
+                    {
+                        print $2
+                    }
+                '
+        )"
+
+        if grep -Eq '^utils/|^\.github/actions/install-opm/action\.yaml$|^\.github/workflows/(create-release|sync-catalog|validate-fbc-catalogs)\.yaml$' \
+            <<< "${changed_files}"; then
+            echo "Validation tooling changed; validating all catalogs."
+            mapfile -t contexts < <(all_contexts)
+        else
+            mapfile -t contexts < <(
+                awk -F/ '
+                    $1 ~ /^v[0-9]+\.[0-9]+$/ &&
+                    NF >= 3 &&
+                    ($3 == "graph.yaml" || $3 == "catalog") {
+                        print $1 "/" $2
+                    }
+                ' <<< "${changed_files}" | sort -u
+            )
+        fi
+    fi
+else
+    usage
+    exit 2
+fi
+
+if [[ ${#contexts[@]} -eq 0 ]]; then
+    echo "No changed FBC catalogs require validation."
+    exit 0
+fi
+
+echo "Catalog contexts to validate:"
+printf '  %s\n' "${contexts[@]}"
+
+failed=0
+for context in "${contexts[@]}"; do
+    if [[ ! -d "${context}" ]]; then
+        echo "Catalog context ${context} was removed; skipping."
+        continue
+    fi
+
+    if ! "${script_dir}/validate_fbc_graph_sync.sh" "${context}"; then
+        failed=1
+    fi
+done
+
+exit "${failed}"