diff --git a/java/jenkins/credentials/acl-system-fill-credential-lookup.yaml b/java/jenkins/credentials/acl-system-fill-credential-lookup.yaml
new file mode 100644
index 0000000..54cd89f
--- /dev/null
+++ b/java/jenkins/credentials/acl-system-fill-credential-lookup.yaml
@@ -0,0 +1,79 @@
+rules:
+  - id: codevigilant.java.jenkins.credentials.acl-system-fill-credential-lookup
+    patterns:
+      - pattern-either:
+          - patterns:
+              - pattern-inside: |
+                  public $RET $HANDLER(...) {
+                    ...
+                  }
+              - metavariable-regex:
+                  metavariable: $HANDLER
+                  regex: ^doFill[A-Z]
+              - pattern-either:
+                  - pattern: CredentialsProvider.lookupCredentials($TYPE, $CTX, ACL.SYSTEM)
+                  - pattern: CredentialsProvider.lookupCredentials($TYPE, $CTX, ACL.SYSTEM, $EXTRA)
+                  - pattern: CredentialsProvider.lookupCredentials($TYPE, $CTX, ACL.SYSTEM, ...)
+                  - pattern: $MODEL.includeMatchingAs(ACL.SYSTEM, ...)
+                  - pattern: $MODEL.includeAs(ACL.SYSTEM, ...)
+                  - pattern: $MODEL.listCredentials(..., ACL.SYSTEM, ...)
+                  - pattern: $MODEL.getCredentialIds(..., ACL.SYSTEM, ...)
+          - patterns:
+              - pattern-inside: |
+                  $RET $HANDLER(...) {
+                    ...
+                  }
+              - metavariable-regex:
+                  metavariable: $RET
+                  regex: .*ListBoxModel
+              - pattern-either:
+                  - pattern: $MODEL.includeMatchingAs(ACL.SYSTEM, ...)
+                  - pattern: $MODEL.includeAs(ACL.SYSTEM, ...)
+                  - pattern: $MODEL.listCredentials(..., ACL.SYSTEM, ...)
+                  - pattern: $MODEL.getCredentialIds(..., ACL.SYSTEM, ...)
+                  - pattern: |
+                      $CTX instanceof Queue.Task ? ((Queue.Task) $CTX).getDefaultAuthentication() : ACL.SYSTEM
+      - pattern-not-inside: |
+          public $RET $HANDLER(...) {
+            ...
+            $X.checkPermission($PERM);
+            ...
+          }
+      - pattern-not-inside: |
+          public $RET $HANDLER(...) {
+            ...
+            $X.hasPermission($PERM);
+            ...
+          }
+    message: |
+      Detected credential enumeration performed with the ACL.SYSTEM
+      authentication instead of the requesting user's authentication. This
+      happens in a Stapler form-filling handler (doFill*), or in a
+      listbox-building helper that such a handler calls, either by passing
+      ACL.SYSTEM to a credential-listing API -- CredentialsProvider
+      lookupCredentials / listCredentials / getCredentialIds, or the
+      credentials-plugin listbox API includeMatchingAs / includeAs -- or by
+      falling back to Queue.Task#getDefaultAuthentication(), whose Jenkins
+      core default is ACL.SYSTEM. Credential metadata (IDs, names, usernames,
+      endpoint metadata) is then returned unfiltered by the caller's
+      permissions, so any user who can reach the descriptor URL can enumerate
+      every stored credential of that type even without Credentials/View
+      permission (CWE-522/CWE-200). Resolve credentials with the caller's
+      authentication (e.g. Jenkins.getAuthentication2(),
+      Tasks.getAuthenticationOf(context)) and guard the handler with an
+      explicit permission check (e.g. context.hasPermission(Item.CONFIGURE)),
+      returning an empty selection when the guard fails.
+    metadata:
+      category: security
+      cwe: "CWE-522: Insufficiently Protected Credentials"
+      owasp: "A01:2021 - Broken Access Control"
+      technology: jenkins
+      confidence: HIGH
+      references:
+        - https://www.jenkins.io/doc/developer/security/
+        - https://javadoc.jenkins.io/plugin/credentials/com/cloudbees/plugins/credentials/CredentialsProvider.html
+      source: independent security review
+      license: MIT
+    languages: [java]
+    mode: search
+    severity: HIGH