diff --git a/server/szurubooru/errors.py b/server/szurubooru/errors.py
index bd8c6691..33bdfce1 100644
--- a/server/szurubooru/errors.py
+++ b/server/szurubooru/errors.py
@@ -1,28 +1,34 @@
-class ConfigError(RuntimeError):
+class BaseError(RuntimeError):
+    def __init__(self, message='Unknown error', extra_fields=None):
+        super().__init__(message)
+        self.extra_fields = extra_fields
+
+
+class ConfigError(BaseError):
     pass
 
 
-class AuthError(RuntimeError):
+class AuthError(BaseError):
     pass
 
 
-class IntegrityError(RuntimeError):
+class IntegrityError(BaseError):
     pass
 
 
-class ValidationError(RuntimeError):
+class ValidationError(BaseError):
     pass
 
 
-class SearchError(RuntimeError):
+class SearchError(BaseError):
     pass
 
 
-class NotFoundError(RuntimeError):
+class NotFoundError(BaseError):
     pass
 
 
-class ProcessingError(RuntimeError):
+class ProcessingError(BaseError):
     pass
 
 
diff --git a/server/szurubooru/facade.py b/server/szurubooru/facade.py
index 60e58d5a..cead9a27 100644
--- a/server/szurubooru/facade.py
+++ b/server/szurubooru/facade.py
@@ -9,34 +9,35 @@ from szurubooru import config, errors, rest
 from szurubooru import api, middleware
 
 
+def _map_error(ex, target_class, title):
+    return target_class(
+        title=title,
+        description=str(ex),
+        extra_fields=getattr(ex, 'extra_fields', {}))
+
+
 def _on_auth_error(ex):
-    raise rest.errors.HttpForbidden(
-        title='Authentication error', description=str(ex))
+    raise _map_error(ex, rest.errors.HttpForbidden, 'Authentication error')
 
 
 def _on_validation_error(ex):
-    raise rest.errors.HttpBadRequest(
-        title='Validation error', description=str(ex))
+    raise _map_error(ex, rest.errors.HttpBadRequest, 'Validation error')
 
 
 def _on_search_error(ex):
-    raise rest.errors.HttpBadRequest(
-        title='Search error', description=str(ex))
+    raise _map_error(ex, rest.errors.HttpBadRequest, 'Search error')
 
 
 def _on_integrity_error(ex):
-    raise rest.errors.HttpConflict(
-        title='Integrity violation', description=ex.args[0])
+    raise _map_error(ex, rest.errors.HttpConflict, 'Integrity violation')
 
 
 def _on_not_found_error(ex):
-    raise rest.errors.HttpNotFound(
-        title='Not found', description=str(ex))
+    raise _map_error(ex, rest.errors.HttpNotFound, 'Not found')
 
 
 def _on_processing_error(ex):
-    raise rest.errors.HttpBadRequest(
-        title='Processing error', description=str(ex))
+    raise _map_error(ex, rest.errors.HttpBadRequest, 'Processing error')
 
 
 def _on_stale_data_error(_ex):
diff --git a/server/szurubooru/rest/app.py b/server/szurubooru/rest/app.py
index 199d0980..da8f2dd9 100644
--- a/server/szurubooru/rest/app.py
+++ b/server/szurubooru/rest/app.py
@@ -102,7 +102,10 @@ def application(env, start_response):
         start_response(
             '%d %s' % (ex.code, ex.reason),
             [('content-type', 'application/json')])
-        return (_dump_json({
+        blob = {
             'title': ex.title,
             'description': ex.description,
-        }).encode('utf-8'),)
+        }
+        for key, value in ex.extra_fields.items():
+            blob[key] = value
+        return (_dump_json(blob).encode('utf-8'),)
diff --git a/server/szurubooru/rest/errors.py b/server/szurubooru/rest/errors.py
index f9755a74..0189147f 100644
--- a/server/szurubooru/rest/errors.py
+++ b/server/szurubooru/rest/errors.py
@@ -5,10 +5,11 @@ class BaseHttpError(RuntimeError):
     code = None
     reason = None
 
-    def __init__(self, description, title=None):
+    def __init__(self, description, title=None, extra_fields=None):
         super().__init__()
         self.description = description
         self.title = title or self.reason
+        self.extra_fields = extra_fields
 
 
 class HttpBadRequest(BaseHttpError):