diff --git a/.github/workflows/_local-charm-scan.yaml b/.github/workflows/_local-charm-scan.yaml
new file mode 100644
index 00000000..f1fe19d8
--- /dev/null
+++ b/.github/workflows/_local-charm-scan.yaml
@@ -0,0 +1,25 @@
+name: Charm Security Scan
+
+on:
+  workflow_dispatch:
+
+jobs:
+  scan:
+    name: Scan fleet
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Install dependencies
+        run: |
+          sudo snap install just --classic
+          sudo snap install yq
+          sudo snap install astral-uv --classic
+
+      - name: Scan every charm in manifest.yaml
+        run: just security::scan-charms
+
+      - name: Build report
+        if: always()
+        run: just security::build-report "$RUNNER_TEMP/results" >> "$GITHUB_STEP_SUMMARY"
diff --git a/.gitignore b/.gitignore
index 2780d237..94c82e69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,8 @@
 **/dist/**
 venv
-.idea/
\ No newline at end of file
+.idea/
+
+# Scratch dirs left behind by `just security::scan-repo` / `build-report`
+# when run locally outside CI (where $RUNNER_TEMP isn't set).
+/charm-checkout/
+/results/
\ No newline at end of file
diff --git a/justfile b/justfile
index 9eee7ee3..d3442a5c 100644
--- a/justfile
+++ b/justfile
@@ -1,6 +1,8 @@
 set quiet  # Recipes are silent by default
 set export  # Just variables are exported to the environment
 
+mod security
+
 [private]
 default:
   just --list
@@ -28,21 +30,21 @@ list-repos:
   } | { grep -vxF -f <(printf '%s\n' "${ignore[@]}") || true; } | sort -u
 
 # List all charms from the manifest
-[group("manifest")]
+[group("info")]
 list-charms:
   #!/usr/bin/env bash
   set -euo pipefail
   yq -r '.artifacts.charms[].name' manifest.yaml | sort -u
 
 # List all rocks from the manifest
-[group("manifest")]
+[group("info")]
 list-rocks:
   #!/usr/bin/env bash
   set -euo pipefail
   yq -r '.artifacts.rocks[].name' manifest.yaml | sort -u
 
 # List all snaps from the manifest
-[group("manifest")]
+[group("info")]
 list-snaps:
   #!/usr/bin/env bash
   set -euo pipefail
diff --git a/security.just b/security.just
new file mode 100644
index 00000000..89792962
--- /dev/null
+++ b/security.just
@@ -0,0 +1,215 @@
+set quiet  # Recipes are silent by default
+set export  # Just variables are exported to the environment
+
+[private]
+default:
+  just -f security.just --list
+
+# List every charm release as JSON, grouped by unique repo
+[private]
+[group("security")]
+scan-matrix:
+  #!/usr/bin/env bash
+  set -euo pipefail
+  # One entry per repo, with the charms/paths/branches it hosts - used by
+  # `scan-charms` to enumerate repos, and by `scan-charm-repo` to look up the
+  # charms hosted in one of them.
+  yq -o=json manifest.yaml | jq -c '
+    [.artifacts.charms[]
+      | .name as $charm | .repo as $repo | .path as $path
+      | .releases[]?
+      | {
+          repo: $repo,
+          branch: .branch,
+          charm: $charm,
+          path: $path,
+          release: .name,
+          cycle: (.cycle | tostring),
+          lts: (.support.lts // false)
+        }
+    ]
+    | group_by(.repo)
+    | map({
+        repo: .[0].repo,
+        charms: map({charm, path, release, branch, cycle, lts})
+      })
+  '
+
+# Run `just scan` on charms in a single repository
+[group("charms")]
+[arg("repo", help="Repository in 'org/repo' form, as it appears in manifest.yaml")]
+scan-charm-repo repo:
+  #!/usr/bin/env python3
+  # Clones `repo` once and checks out each branch it hosts charms on in turn -
+  # only branches that are actually listed in manifest.yaml, nothing else -
+  # running `just scan` per charm and writing one result JSON per charm under
+  # $RUNNER_TEMP/results (or ./results outside CI). Exits non-zero if any branch
+  # failed to check out; vulnerabilities found by `just scan` are recorded but
+  # don't fail the recipe. Used by the _local-charm-scan.yaml workflow, but also
+  # runs standalone, e.g.: just security::scan-charm-repo canonical/litmus-operators
+  import json
+  import os
+  import subprocess
+  import sys
+  from pathlib import Path
+
+  repo = "{{ repo }}"
+  results_dir = Path(os.environ.get("RUNNER_TEMP", ".")) / "results"
+  results_dir.mkdir(parents=True, exist_ok=True)
+
+  def run(*args, cwd=None):
+      # Merge stdout/stderr (like a shell's `2>&1`) so captured logs read in order.
+      return subprocess.run(args, cwd=cwd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True)
+
+  def record(charm, release, cycle, lts, branch, status, log):
+      result = {
+          "charm": charm, "release": release, "cycle": cycle, "lts": lts,
+          "repo": repo, "branch": branch, "status": status,
+          "log": log or "(no output captured)",
+      }
+      (results_dir / f"{charm}-{release}.json").write_text(json.dumps(result))
+
+  # A fresh `just` subprocess re-resolves modules from scratch, so sibling
+  # recipes in this same module still need their fully-qualified name here.
+  matrix = json.loads(subprocess.run(
+      ["just", "security::scan-matrix"], capture_output=True, text=True, check=True
+  ).stdout)
+  entry = next((e for e in matrix if e["repo"] == repo), None)
+  charms = entry["charms"] if entry else []
+  if not charms:
+      print(f"No charms found for repo '{repo}' in manifest.yaml", file=sys.stderr)
+      sys.exit(1)
+
+  checkout_dir = Path("charm-checkout")
+  clone = run(
+      "git", "clone", "--quiet", "--no-checkout", "--depth=1", "--no-single-branch",
+      f"https://github.com/{repo}.git", str(checkout_dir),
+  )
+
+  any_failed = False
+  if clone.returncode != 0:
+      any_failed = True
+      for c in charms:
+          record(c["charm"], c["release"], c["cycle"], c["lts"], c["branch"], "checkout-failed", clone.stdout)
+  else:
+      for branch in sorted({c["branch"] for c in charms}):
+          checkout = run("git", "checkout", "--quiet", "-B", branch, f"origin/{branch}", cwd=checkout_dir)
+          branch_ok = checkout.returncode == 0
+          any_failed = any_failed or not branch_ok
+
+          for c in (c for c in charms if c["branch"] == branch):
+              if not branch_ok:
+                  status, log = "checkout-failed", checkout.stdout
+              else:
+                  scan = run("just", "scan", cwd=checkout_dir / c["path"])
+                  status = "pass" if scan.returncode == 0 else "vulnerabilities-found"
+                  log = scan.stdout
+              record(c["charm"], c["release"], c["cycle"], c["lts"], branch, status, log)
+
+  if any_failed:
+      print(f"::error::One or more branches of {repo} failed to check out", file=sys.stderr)
+      sys.exit(1)
+
+# Run `just scan` on every charm in manifest.yaml, one repo at a time
+[group("charms")]
+scan-charms:
+  #!/usr/bin/env bash
+  set -euo pipefail
+  # Sequential on purpose: each `scan-charm-repo` call is a shallow clone plus
+  # a handful of lightweight `uv audit` runs, so parallelizing this across one
+  # runner per repo bought little beyond N-times the runner/artifact overhead.
+  # Continues past a repo that fails (matching scan-charm-repo's own
+  # per-branch tolerance) but still exits non-zero at the end if any did.
+  matrix="$(just security::scan-matrix)"
+  releases="$(echo "$matrix" | jq '[.[].charms[]] | length')"
+  repos="$(echo "$matrix" | jq -r '.[].repo')"
+  repo_count="$(echo "$repos" | wc -l)"
+  echo "Scanning $releases charm releases across $repo_count repos"
+
+  any_failed=0
+  while IFS= read -r repo; do
+    just security::scan-charm-repo "$repo" || any_failed=1
+  done <<< "$repos"
+
+  exit "$any_failed"
+
+# Build the scan-charm markdown report from a directory of result JSON files
+[group("report")]
+build-report results_dir="results":
+  #!/usr/bin/env python3
+  # Searches results_dir recursively, so this works with both a flat directory
+  # and the one-artifact-per-repo-subdirectory layout actions/download-artifact
+  # produces. Prints the report to stdout - redirect it into $GITHUB_STEP_SUMMARY
+  # in CI, or just read it directly when running locally, e.g.:
+  #   just security::build-report results
+  # Exits non-zero if any result was checkout-failed (does not affect stdout).
+  import glob
+  import html
+  import json
+  import sys
+
+  results = []
+  for path in glob.glob("{{ results_dir }}/**/*.json", recursive=True):
+      with open(path) as f:
+          results.append(json.load(f))
+
+  if not results:
+      print("# :mag: Charm Security Scan Report\n")
+      print("No charm releases found in `manifest.yaml`.")
+      sys.exit(0)
+
+  results.sort(key=lambda r: (r["cycle"], r["charm"], r["release"]))
+
+  badges = {
+      "pass": "✅",
+      "vulnerabilities-found": "⚠️",
+      "checkout-failed": "❌",
+  }
+  status_text = {
+      "pass": "pass",
+      "vulnerabilities-found": "vulnerabilities found",
+      "checkout-failed": "checkout failed",
+  }
+
+  counts = {"pass": 0, "vulnerabilities-found": 0, "checkout-failed": 0}
+  for r in results:
+      counts[r["status"]] += 1
+
+  lines = []
+  lines.append("# :mag: Charm Security Scan Report")
+  lines.append("")
+  lines.append(
+      f"**{len(results)} releases scanned** · "
+      f"{badges['pass']} {counts['pass']} pass · "
+      f"{badges['vulnerabilities-found']} {counts['vulnerabilities-found']} flagged · "
+      f"{badges['checkout-failed']} {counts['checkout-failed']} checkout failed"
+  )
+  lines.append("")
+
+  current_cycle = None
+  for r in results:
+      if r["cycle"] != current_cycle:
+          current_cycle = r["cycle"]
+          lines.append(f"## Cycle `{current_cycle}`")
+          lines.append("")
+
+      badge = badges[r["status"]]
+      lts_label = "LTS" if r["lts"] else "non-LTS"
+      summary = (
+          f"{badge} <b>{r['charm']}</b> {r['release']} ({lts_label}) "
+          f"— {status_text[r['status']]}"
+      )
+      lines.append("<details>")
+      lines.append(f"<summary>{summary}</summary>")
+      lines.append("")
+      lines.append(f"`{r['repo']}@{r['branch']}`")
+      lines.append("")
+      lines.append(f"<pre>{html.escape(r['log'])}</pre>")
+      lines.append("</details>")
+      lines.append("")
+
+  print("\n".join(lines))
+
+  if counts["checkout-failed"] > 0:
+      print(f"::error::{counts['checkout-failed']} charm(s) failed to check out; see the report above.", file=sys.stderr)
+      sys.exit(1)