diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 4b68c7e..79b5290 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -12,6 +12,25 @@ https://semver.org/[Semantic Versioning].
 
 === Added
 
+==== `CicdRules` rule `scorecard_wrapper_missing_job_permissions` (2026-05-30, #390)
+
+New forward-detection rule for a silent-CI-failure class: a
+`.github/workflows/scorecard.yml` that *calls* the standards
+`scorecard-reusable.yml` but omits `security-events: write` on the calling
+job. Called-workflow permissions are capped by the caller, so
+`ossf/scorecard-action` cannot upload its SARIF and every scheduled
+Scorecard run fails with `startup_failure` — no logs. Estate baseline
+2026-05-30: 37 affected wrappers (35 unique + 2 inert nested-monorepo
+copies). Prior art: `julia-professional-registry#19`, `absolute-zero#68`.
+
+Surfaced through the facade as
+`Hypatia.Rules.scan_scorecard_wrapper_permissions/2`; the pure predicate
+`CicdRules.check_scorecard_wrapper_permissions/2` and an
+`opts[:path_allow_prefixes]` carve-out (for bespoke inline scorecard
+workflows) are covered by `test/rules/cicd_rules_scorecard_wrapper_test.exs`
+for both sensitivity (positive + nested copy) and specificity (perm present,
+no-reusable, carve-out).
+
 ==== `WorkflowAudit` rules WF014–WF017 (2026-05-30, PRs #393 + #396)
 
 Four new forward-detection rules surfacing patterns root-fixed in
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 781aa6e..bf37675 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ this project aims to follow [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- feat(rules): CicdRules `scorecard_wrapper_missing_job_permissions` — flag scorecard.yml wrappers that call the standards reusable but omit `security-events: write` on the calling job (#390)
 - feat(rules): AffineScript hand-port pitfalls — HANDLE-as-fn-name + OCaml float ops (#332)
 - feat(rules): wire 4 new rule modules through the facade (#326)
 - feat(rules): ResearchExtensions (RE001-RE010) — 10 rules from Snyk/StepSecurity/Endor/academic literature (#325)
diff --git a/lib/rules/cicd_rules.ex b/lib/rules/cicd_rules.ex
index 0992b16..52dc659 100644
--- a/lib/rules/cicd_rules.ex
+++ b/lib/rules/cicd_rules.ex
@@ -834,6 +834,102 @@ defmodule Hypatia.Rules.CicdRules do
     end
   end
 
+  # ---------------------------------------------------------------------------
+  # Scorecard Wrapper Permissions (#390)
+  # ---------------------------------------------------------------------------
+  #
+  # A `.github/workflows/scorecard.yml` that *calls* the standards
+  # `scorecard-reusable.yml` MUST grant `security-events: write` (and
+  # `id-token: write`) on the calling job. Called-workflow permissions are
+  # CAPPED by the caller, so a wrapper that omits the grant leaves
+  # `ossf/scorecard-action` unable to upload its SARIF — every scheduled
+  # Scorecard run then fails with `startup_failure` and *no logs*. That
+  # silent-CI-failure shape is exactly what Hypatia exists to catch.
+  #
+  # Estate baseline 2026-05-30: 37 affected wrappers (35 unique + 2 inert
+  # nested-monorepo copies). Prior art: julia-professional-registry#19,
+  # absolute-zero#68 (memory: feedback_scorecard_wrapper_caller_permissions).
+
+  @scorecard_wrapper_path ".github/workflows/scorecard.yml"
+  @scorecard_reusable_marker "scorecard-reusable.yml"
+  @scorecard_required_perm ~r/security-events:\s*write/
+  @scorecard_missing_perm_reason "scorecard.yml calls the standards scorecard-reusable.yml but does not grant `security-events: write` on the calling job; called-workflow permissions are capped by the caller, so ossf/scorecard-action cannot upload its SARIF and the scheduled Scorecard run fails with `startup_failure` (silent CI failure, no logs)."
+  @scorecard_missing_perm_fix "Grant the calling job `security-events: write` (and `id-token: write`); the reusable re-asserts them, but the caller caps them:\n    permissions:\n      security-events: write\n      id-token: write"
+
+  @doc """
+  Scan `repo_path` for scorecard wrappers that call the standards reusable
+  but omit the required `security-events: write` job permission (#390).
+
+  A finding is emitted for each `.github/workflows/scorecard.yml` (repo-root
+  *or* nested monorepo copy) that, in the same file:
+
+    * references `scorecard-reusable.yml` (i.e. uses the reusable), AND
+    * does NOT grant `security-events: write`.
+
+  Inline scorecard workflows that do not call the reusable are ignored by
+  construction (the first condition fails). `opts[:path_allow_prefixes]` is a
+  list of substrings; any wrapper whose relative path contains one is skipped
+  — an explicit carve-out for bespoke scorecard workflows that manage their
+  own permissions shape.
+
+  Returns `[%{rule:, severity:, file:, reason:, fix:}]`.
+  """
+  def scan_scorecard_wrapper_permissions(repo_path, opts \\ []) do
+    allow_prefixes = Keyword.get(opts, :path_allow_prefixes, [])
+
+    Path.wildcard("#{repo_path}/**/*", match_dot: true)
+    |> Enum.reject(&File.dir?/1)
+    |> Enum.map(&Path.relative_to(&1, repo_path))
+    |> Enum.filter(fn rel ->
+      not String.starts_with?(rel, ".git/") and scorecard_wrapper_path?(rel)
+    end)
+    |> Enum.reject(fn rel -> Enum.any?(allow_prefixes, &String.contains?(rel, &1)) end)
+    |> Enum.flat_map(fn rel ->
+      case File.read(Path.join(repo_path, rel)) do
+        {:ok, content} ->
+          case check_scorecard_wrapper_permissions(rel, content) do
+            {:fail, finding} -> [finding]
+            :ok -> []
+          end
+
+        {:error, _} ->
+          []
+      end
+    end)
+  end
+
+  @doc """
+  Pure predicate behind `scan_scorecard_wrapper_permissions/2`.
+
+  Given a scorecard wrapper's relative `path` and its `content`, returns
+  `{:fail, finding}` when the file calls the standards reusable but does not
+  grant `security-events: write`, or `:ok` otherwise.
+  """
+  def check_scorecard_wrapper_permissions(path, content) do
+    uses_reusable? = String.contains?(content, @scorecard_reusable_marker)
+    grants_perm? = Regex.match?(@scorecard_required_perm, content)
+
+    if uses_reusable? and not grants_perm? do
+      finding = %{
+        rule: :scorecard_wrapper_missing_job_permissions,
+        severity: :high,
+        file: path,
+        reason: @scorecard_missing_perm_reason,
+        fix: @scorecard_missing_perm_fix
+      }
+
+      {:fail, finding}
+    else
+      :ok
+    end
+  end
+
+  # True when `rel` is a scorecard wrapper workflow — the repo-root copy or
+  # any nested monorepo copy (`pkg/.github/workflows/scorecard.yml`).
+  defp scorecard_wrapper_path?(rel) do
+    rel == @scorecard_wrapper_path or String.ends_with?(rel, "/" <> @scorecard_wrapper_path)
+  end
+
   # ---------------------------------------------------------------------------
   # CI/CD Waste Detection
   # ---------------------------------------------------------------------------
diff --git a/lib/rules/rules.ex b/lib/rules/rules.ex
index de582fb..eca55fb 100644
--- a/lib/rules/rules.ex
+++ b/lib/rules/rules.ex
@@ -422,6 +422,12 @@ defmodule Hypatia.Rules do
   """
   defdelegate detect_waste(repo_info), to: CicdRules
 
+  @doc """
+  Scan for scorecard wrappers that call the standards reusable but omit the
+  required `security-events: write` job permission (#390).
+  """
+  defdelegate scan_scorecard_wrapper_permissions(repo_path, opts \\ []), to: CicdRules
+
   @doc """
   Run baseline-health checks (BH001-BH007): missing required_status_checks
   on main, deferred-migration TODOs in dep manifests, persistent >24h red
diff --git a/test/rules/cicd_rules_scorecard_wrapper_test.exs b/test/rules/cicd_rules_scorecard_wrapper_test.exs
new file mode 100644
index 0000000..2d43417
--- /dev/null
+++ b/test/rules/cicd_rules_scorecard_wrapper_test.exs
@@ -0,0 +1,128 @@
+# SPDX-License-Identifier: MPL-2.0
+
+defmodule Hypatia.Rules.CicdRules.ScorecardWrapperTest do
+  use ExUnit.Case, async: true
+
+  alias Hypatia.Rules.CicdRules
+
+  # #390 — a `.github/workflows/scorecard.yml` that CALLS the standards
+  # `scorecard-reusable.yml` must grant `security-events: write` on the
+  # calling job, or the scheduled Scorecard run fails with `startup_failure`
+  # (no logs). Detection: uses "scorecard-reusable.yml" AND NOT
+  # "security-events: write". Sensitivity + specificity both covered.
+
+  @wf_path ".github/workflows/scorecard.yml"
+
+  @reusable_no_perm """
+  # SPDX-License-Identifier: MPL-2.0
+  name: Scorecard
+  on:
+    schedule:
+      - cron: "0 2 * * 1"
+  permissions: read-all
+  jobs:
+    analysis:
+      uses: hyperpolymath/standards/.github/workflows/scorecard-reusable.yml@abc1234
+  """
+
+  @reusable_with_perm """
+  # SPDX-License-Identifier: MPL-2.0
+  name: Scorecard
+  on:
+    schedule:
+      - cron: "0 2 * * 1"
+  permissions: read-all
+  jobs:
+    analysis:
+      permissions:
+        security-events: write
+        id-token: write
+      uses: hyperpolymath/standards/.github/workflows/scorecard-reusable.yml@abc1234
+  """
+
+  @inline_no_reusable """
+  # SPDX-License-Identifier: MPL-2.0
+  name: Scorecard
+  on:
+    schedule:
+      - cron: "0 2 * * 1"
+  permissions: read-all
+  jobs:
+    analysis:
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v4
+        - uses: ossf/scorecard-action@v2
+  """
+
+  setup do
+    dir = Path.join(System.tmp_dir!(), "hyp-scw-#{:erlang.unique_integer([:positive])}")
+    File.mkdir_p!(dir)
+    on_exit(fn -> File.rm_rf!(dir) end)
+    {:ok, dir: dir}
+  end
+
+  defp write_scorecard(dir, body, sub \\ "") do
+    rel = if sub == "", do: @wf_path, else: Path.join(sub, @wf_path)
+    path = Path.join(dir, rel)
+    File.mkdir_p!(Path.dirname(path))
+    File.write!(path, body)
+    path
+  end
+
+  describe "scan_scorecard_wrapper_permissions/2 — sensitivity" do
+    test "fires when wrapper uses reusable but lacks the perm", %{dir: dir} do
+      write_scorecard(dir, @reusable_no_perm)
+      assert [finding] = CicdRules.scan_scorecard_wrapper_permissions(dir)
+      assert finding.rule == :scorecard_wrapper_missing_job_permissions
+      assert finding.severity == :high
+      assert finding.file == @wf_path
+      assert finding.fix =~ "security-events: write"
+    end
+
+    test "fires on a nested monorepo copy", %{dir: dir} do
+      write_scorecard(dir, @reusable_no_perm, "packages/api")
+      assert [finding] = CicdRules.scan_scorecard_wrapper_permissions(dir)
+      assert finding.file == "packages/api/" <> @wf_path
+    end
+  end
+
+  describe "scan_scorecard_wrapper_permissions/2 — specificity" do
+    test "silent when wrapper grants the perm", %{dir: dir} do
+      write_scorecard(dir, @reusable_with_perm)
+      assert CicdRules.scan_scorecard_wrapper_permissions(dir) == []
+    end
+
+    test "silent for inline scorecard not using the reusable", %{dir: dir} do
+      write_scorecard(dir, @inline_no_reusable)
+      assert CicdRules.scan_scorecard_wrapper_permissions(dir) == []
+    end
+
+    test "path_allow_prefixes carve-out skips the wrapper", %{dir: dir} do
+      write_scorecard(dir, @reusable_no_perm, "vendor/upstream")
+
+      findings =
+        CicdRules.scan_scorecard_wrapper_permissions(dir, path_allow_prefixes: ["vendor/"])
+
+      assert findings == []
+    end
+  end
+
+  describe "check_scorecard_wrapper_permissions/2 — pure predicate" do
+    test "fail when reusable present and perm absent" do
+      result = CicdRules.check_scorecard_wrapper_permissions(@wf_path, @reusable_no_perm)
+      assert {:fail, finding} = result
+      assert finding.rule == :scorecard_wrapper_missing_job_permissions
+      assert finding.reason =~ "startup_failure"
+    end
+
+    test "ok when perm present with irregular spacing" do
+      body = String.replace(@reusable_no_perm, "uses:", "security-events:   write\n      uses:")
+      assert :ok = CicdRules.check_scorecard_wrapper_permissions(@wf_path, body)
+    end
+
+    test "ok when reusable not called" do
+      assert :ok = CicdRules.check_scorecard_wrapper_permissions(@wf_path, @inline_no_reusable)
+    end
+  end
+end