Fix Folder access filtering

Jellyfin.Server.Implementations/Item/BaseItemRepository.QueryBuilding.cs

@@ -395,6 +395,17 @@ public sealed partial class BaseItemRepository
         return ApplyAccessFiltering(context, baseQuery, filter);
     }
 
+    /// <summary>
+    /// Checks whether the user restricts access to items by parental rating or tags.
+    /// </summary>
+    /// <param name="filter">The query filter.</param>
+    /// <returns><c>true</c> if the query carries parental restrictions.</returns>
+    private static bool RequiresParentalRestrictions(InternalItemsQuery filter)
+        => filter.IncludeInheritedTags.Length > 0
+            || filter.ExcludeInheritedTags.Length > 0
+            || filter.MaxParentalRating is not null
+            || filter.BlockUnratedItems.Length > 0;
+
     /// <summary>
     /// Applies user access filtering to a query.
     /// Includes TopParentIds, parental rating, and tag filtering.
@@ -412,6 +423,30 @@ public sealed partial class BaseItemRepository
             baseQuery = baseQuery.Where(e => topParentIds.Contains(e.TopParentId!.Value));
         }
 
+        baseQuery = ApplyParentalRestrictions(context, baseQuery, filter);
+
+        // Exclude alternate versions (have PrimaryVersionId set) and owned non-extra items.
+        // Extras (trailers, etc.) have OwnerId set but also have ExtraType set — keep those.
+        if (!filter.IncludeOwnedItems)
+        {
+            baseQuery = baseQuery.Where(e => e.PrimaryVersionId == null && (e.OwnerId == null || e.ExtraType != null));
+        }
+
+        return baseQuery;
+    }
+
+    /// <summary>
+    /// Applies the user's parental rating and tag restrictions to a query.
+    /// </summary>
+    /// <param name="context">The database context.</param>
+    /// <param name="baseQuery">The query to filter.</param>
+    /// <param name="filter">The query filter.</param>
+    /// <returns>The filtered query.</returns>
+    private IQueryable<BaseItemEntity> ApplyParentalRestrictions(
+        JellyfinDbContext context,
+        IQueryable<BaseItemEntity> baseQuery,
+        InternalItemsQuery filter)
+    {
         // Apply parental rating filtering
         if (filter.MaxParentalRating is not null)
         {
@@ -462,13 +497,6 @@ public sealed partial class BaseItemRepository
                 || e.Type == personTypeName);
         }
 
-        // Exclude alternate versions (have PrimaryVersionId set) and owned non-extra items.
-        // Extras (trailers, etc.) have OwnerId set but also have ExtraType set — keep those.
-        if (!filter.IncludeOwnedItems)
-        {
-            baseQuery = baseQuery.Where(e => e.PrimaryVersionId == null && (e.OwnerId == null || e.ExtraType != null));
-        }
-
         return baseQuery;
     }
 

Jellyfin.Server.Implementations/Item/BaseItemRepository.Querying.cs

@@ -167,7 +167,10 @@ public sealed partial class BaseItemRepository
                 .Where(album => albumIdsWithMatchingTrack.Contains(album.Id));
         }
 
-        var orderedAlbums = topAlbumsQuery
+        // The album is what gets returned, and neither branch above reads it through the
+        // user's filters, so its own parental restrictions have to be applied here: a
+        // matching track does not make an album the user may not see visible.
+        var orderedAlbums = ApplyParentalRestrictions(context, topAlbumsQuery, filter)
             .OrderByDescending(album => album.DateCreated)
             .ThenByDescending(album => album.Id);
 
@@ -420,6 +423,40 @@ public sealed partial class BaseItemRepository
             seriesResults.Add((seasonId, seriesId, maxDate, mostRecentEpisodeId));
         }
 
+        // Step 5b: A container is what gets returned, so it has to pass the user's access
+        // filters on its own - a matching episode does not make a Season or Series the user
+        // may not see visible. Containers that don't pass are replaced by their episode.
+        if (RequiresParentalRestrictions(filter) && entitiesToFetch.Count > 0)
+        {
+            var allowedContainerIds = ApplyParentalRestrictions(
+                    context,
+                    context.BaseItems.AsNoTracking().Where(e => entitiesToFetch.Contains(e.Id)),
+                    filter)
+                .Select(e => e.Id)
+                .ToHashSet();
+
+            for (var i = 0; i < seriesResults.Count; i++)
+            {
+                var (seasonId, seriesId, maxDate, mostRecentEpisodeId) = seriesResults[i];
+                if (seasonId.HasValue && !allowedContainerIds.Contains(seasonId.Value))
+                {
+                    seasonId = null;
+                }
+
+                if (seriesId.HasValue && !allowedContainerIds.Contains(seriesId.Value))
+                {
+                    seriesId = null;
+                }
+
+                if (seasonId is null && seriesId is null)
+                {
+                    entitiesToFetch.Add(mostRecentEpisodeId);
+                }
+
+                seriesResults[i] = (seasonId, seriesId, maxDate, mostRecentEpisodeId);
+            }
+        }
+
         // Step 6: Fetch the Season/Series entities we decided to return
         var entities = entitiesToFetch.Count > 0
             ? ApplyNavigations(