diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 000000000..75a51fc7c
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,14 @@
+## 2.5.2
+
+- Fix XSS vulnerability (#8959)
+
+## 2.5.1
+
+- Fix some local images not having their EXIF metadata stripped on upload (#8714)
+- Fix class autoloading issue in ActivityPub Create handler (#8820)
+- Fix cache statistics not being sent via statsd when statsd enabled (#8831)
+- Fix being able to enable a disabled relay via ActivityPub Accept handler (#8864)
+- Bump nokogiri from 1.8.4 to 1.8.5 (#8881)
+- Bump puma from 3.11.4 to 3.12.0 (#8883)
+- Fix database migrations for PostgreSQL below 9.5 (#8903)
+- Fix being able to report statuses not belonging to the reported account (#8916)
diff --git a/Gemfile b/Gemfile
index bdac00b48..fc61a268f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ ruby '>= 2.3.0', '< 2.6.0'
 
 gem 'pkg-config', '~> 1.3'
 
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 gem 'rails', '~> 5.2.1'
 gem 'thor', '~> 0.20'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 502d08efe..bbbcc3423 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -347,7 +347,7 @@ GEM
       net-ssh (>= 2.6.5)
     net-ssh (4.2.0)
     nio4r (2.3.1)
-    nokogiri (1.8.4)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     nokogumbo (1.5.0)
       nokogiri
@@ -412,7 +412,7 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     public_suffix (3.0.2)
-    puma (3.11.4)
+    puma (3.12.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
     rack (2.0.5)
@@ -721,7 +721,7 @@ DEPENDENCIES
   private_address_check (~> 0.4.1)
   pry-byebug (~> 3.6)
   pry-rails (~> 0.3)
-  puma (~> 3.11)
+  puma (~> 3.12)
   pundit (~> 1.1)
   rack-attack (~> 5.2)
   rack-cors (~> 1.0)
@@ -765,4 +765,4 @@ RUBY VERSION
    ruby 2.5.0p0
 
 BUNDLED WITH
-   1.16.3
+   1.16.5
diff --git a/app/controllers/api/v1/reports_controller.rb b/app/controllers/api/v1/reports_controller.rb
index a954101cb..2aac5e61e 100644
--- a/app/controllers/api/v1/reports_controller.rb
+++ b/app/controllers/api/v1/reports_controller.rb
@@ -27,7 +27,7 @@ class Api::V1::ReportsController < Api::BaseController
   private
 
   def reported_status_ids
-    Status.find(status_ids).pluck(:id)
+    reported_account.statuses.find(status_ids).pluck(:id)
   end
 
   def status_ids
diff --git a/app/controllers/concerns/signature_verification.rb b/app/controllers/concerns/signature_verification.rb
index 4d77fa432..e5d5e2ca6 100644
--- a/app/controllers/concerns/signature_verification.rb
+++ b/app/controllers/concerns/signature_verification.rb
@@ -22,6 +22,12 @@ module SignatureVerification
       return
     end
 
+    if request.headers['Date'].present? && !matches_time_window?
+      @signature_verification_failure_reason = 'Signed request date outside acceptable time window'
+      @signed_request_account = nil
+      return
+    end
+
     raw_signature    = request.headers['Signature']
     signature_params = {}
 
@@ -76,7 +82,7 @@ module SignatureVerification
   def build_signed_string(signed_headers)
     signed_headers = 'date' if signed_headers.blank?
 
-    signed_headers.split(' ').map do |signed_header|
+    signed_headers.downcase.split(' ').map do |signed_header|
       if signed_header == Request::REQUEST_TARGET
         "#{Request::REQUEST_TARGET}: #{request.method.downcase} #{request.path}"
       elsif signed_header == 'digest'
@@ -89,12 +95,12 @@ module SignatureVerification
 
   def matches_time_window?
     begin
-      time_sent = DateTime.httpdate(request.headers['Date'])
+      time_sent = Time.httpdate(request.headers['Date'])
     rescue ArgumentError
       return false
     end
 
-    (Time.now.utc - time_sent).abs <= 30
+    (Time.now.utc - time_sent).abs <= 12.hours
   end
 
   def body_digest
diff --git a/app/lib/activitypub/activity/accept.rb b/app/lib/activitypub/activity/accept.rb
index 7e60b2c00..348ee0d1c 100644
--- a/app/lib/activitypub/activity/accept.rb
+++ b/app/lib/activitypub/activity/accept.rb
@@ -26,7 +26,7 @@ class ActivityPub::Activity::Accept < ActivityPub::Activity
   end
 
   def relay
-    @relay ||= Relay.find_by(follow_activity_id: object_uri)
+    @relay ||= Relay.find_by(follow_activity_id: object_uri) unless object_uri.nil?
   end
 
   def relay_follow?
diff --git a/app/lib/activitypub/activity/create.rb b/app/lib/activitypub/activity/create.rb
index f40e1fa3e..978289788 100644
--- a/app/lib/activitypub/activity/create.rb
+++ b/app/lib/activitypub/activity/create.rb
@@ -92,7 +92,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
     return if tag['href'].blank?
 
     account = account_from_uri(tag['href'])
-    account = FetchRemoteAccountService.new.call(tag['href'], id: false) if account.nil?
+    account = ::FetchRemoteAccountService.new.call(tag['href'], id: false) if account.nil?
     return if account.nil?
     account.mentions.create(status: status)
   end
diff --git a/app/lib/activitypub/activity/delete.rb b/app/lib/activitypub/activity/delete.rb
index 3474d55d9..457047ac0 100644
--- a/app/lib/activitypub/activity/delete.rb
+++ b/app/lib/activitypub/activity/delete.rb
@@ -17,6 +17,8 @@ class ActivityPub::Activity::Delete < ActivityPub::Activity
   end
 
   def delete_note
+    return if object_uri.nil?
+
     @status   = Status.find_by(uri: object_uri, account: @account)
     @status ||= Status.find_by(uri: @object['atomUri'], account: @account) if @object.is_a?(Hash) && @object['atomUri'].present?
 
diff --git a/app/lib/activitypub/activity/reject.rb b/app/lib/activitypub/activity/reject.rb
index d81b157de..dba21fb9a 100644
--- a/app/lib/activitypub/activity/reject.rb
+++ b/app/lib/activitypub/activity/reject.rb
@@ -28,7 +28,7 @@ class ActivityPub::Activity::Reject < ActivityPub::Activity
   end
 
   def relay
-    @relay ||= Relay.find_by(follow_activity_id: object_uri)
+    @relay ||= Relay.find_by(follow_activity_id: object_uri) unless object_uri.nil?
   end
 
   def relay_follow?
diff --git a/app/lib/activitypub/activity/undo.rb b/app/lib/activitypub/activity/undo.rb
index 64c2be7d9..599823c6e 100644
--- a/app/lib/activitypub/activity/undo.rb
+++ b/app/lib/activitypub/activity/undo.rb
@@ -19,6 +19,8 @@ class ActivityPub::Activity::Undo < ActivityPub::Activity
   private
 
   def undo_announce
+    return if object_uri.nil?
+
     status   = Status.find_by(uri: object_uri, account: @account)
     status ||= Status.find_by(uri: @object['atomUri'], account: @account) if @object.is_a?(Hash) && @object['atomUri'].present?
 
diff --git a/app/lib/formatter.rb b/app/lib/formatter.rb
index 8b694536c..35d5a09b7 100644
--- a/app/lib/formatter.rb
+++ b/app/lib/formatter.rb
@@ -90,8 +90,12 @@ class Formatter
 
   private
 
+  def html_entities
+    @html_entities ||= HTMLEntities.new
+  end
+
   def encode(html)
-    HTMLEntities.new.encode(html)
+    html_entities.encode(html)
   end
 
   def encode_and_link_urls(html, accounts = nil, options = {})
@@ -143,7 +147,7 @@ class Formatter
         emoji     = emoji_map[shortcode]
 
         if emoji
-          replacement = "<img draggable=\"false\" class=\"emojione\" alt=\":#{shortcode}:\" title=\":#{shortcode}:\" src=\"#{emoji}\" />"
+          replacement = "<img draggable=\"false\" class=\"emojione\" alt=\":#{encode(shortcode)}:\" title=\":#{encode(shortcode)}:\" src=\"#{encode(emoji)}\" />"
           before_html = shortname_start_index.positive? ? html[0..shortname_start_index - 1] : ''
           html        = before_html + replacement + html[i + 1..-1]
           i          += replacement.size - (shortcode.size + 2) - 1
@@ -212,7 +216,7 @@ class Formatter
     return link_to_account(acct) unless linkable_accounts
 
     account = linkable_accounts.find { |item| TagManager.instance.same_acct?(item.acct, acct) }
-    account ? mention_html(account) : "@#{acct}"
+    account ? mention_html(account) : "@#{encode(acct)}"
   end
 
   def link_to_account(acct)
@@ -221,7 +225,7 @@ class Formatter
     domain  = nil if TagManager.instance.local_domain?(domain)
     account = EntityCache.instance.mention(username, domain)
 
-    account ? mention_html(account) : "@#{acct}"
+    account ? mention_html(account) : "@#{encode(acct)}"
   end
 
   def link_to_hashtag(entity)
@@ -239,10 +243,10 @@ class Formatter
   end
 
   def hashtag_html(tag)
-    "<a href=\"#{tag_url(tag.downcase)}\" class=\"mention hashtag\" rel=\"tag\">#<span>#{tag}</span></a>"
+    "<a href=\"#{encode(tag_url(tag.downcase))}\" class=\"mention hashtag\" rel=\"tag\">#<span>#{encode(tag)}</span></a>"
   end
 
   def mention_html(account)
-    "<span class=\"h-card\"><a href=\"#{TagManager.instance.url_for(account)}\" class=\"u-url mention\">@<span>#{account.username}</span></a></span>"
+    "<span class=\"h-card\"><a href=\"#{encode(TagManager.instance.url_for(account))}\" class=\"u-url mention\">@<span>#{encode(account.username)}</span></a></span>"
   end
 end
diff --git a/config/initializers/statsd.rb b/config/initializers/statsd.rb
index 45702ac94..ce83fd9de 100644
--- a/config/initializers/statsd.rb
+++ b/config/initializers/statsd.rb
@@ -9,7 +9,7 @@ if ENV['STATSD_ADDR'].present?
   ::NSA.inform_statsd(statsd) do |informant|
     informant.collect(:action_controller, :web)
     informant.collect(:active_record, :db)
-    informant.collect(:cache, :cache)
+    informant.collect(:active_support_cache, :cache)
     informant.collect(:sidekiq, :sidekiq)
   end
 end
diff --git a/db/migrate/20180812173710_copy_status_stats.rb b/db/migrate/20180812173710_copy_status_stats.rb
index 850aa9c13..ff10c18d9 100644
--- a/db/migrate/20180812173710_copy_status_stats.rb
+++ b/db/migrate/20180812173710_copy_status_stats.rb
@@ -3,15 +3,10 @@ class CopyStatusStats < ActiveRecord::Migration[5.2]
 
   def up
     safety_assured do
-      Status.unscoped.select('id').find_in_batches(batch_size: 5_000) do |statuses|
-        execute <<-SQL.squish
-          INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at)
-          SELECT id, reblogs_count, favourites_count, created_at, updated_at
-          FROM statuses
-          WHERE id IN (#{statuses.map(&:id).join(', ')})
-          ON CONFLICT (status_id) DO UPDATE
-          SET reblogs_count = EXCLUDED.reblogs_count, favourites_count = EXCLUDED.favourites_count
-        SQL
+      if supports_upsert?
+        up_fast
+      else
+        up_slow
       end
     end
   end
@@ -19,4 +14,41 @@ class CopyStatusStats < ActiveRecord::Migration[5.2]
   def down
     # Nothing
   end
+
+  private
+
+  def supports_upsert?
+    version = select_one("SELECT current_setting('server_version_num') AS v")['v'].to_i
+    version >= 90500
+  end
+
+  def up_fast
+    say 'Upsert is available, importing counters using the fast method'
+
+    Status.unscoped.select('id').find_in_batches(batch_size: 5_000) do |statuses|
+      execute <<-SQL.squish
+        INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at)
+        SELECT id, reblogs_count, favourites_count, created_at, updated_at
+        FROM statuses
+        WHERE id IN (#{statuses.map(&:id).join(', ')})
+        ON CONFLICT (status_id) DO UPDATE
+        SET reblogs_count = EXCLUDED.reblogs_count, favourites_count = EXCLUDED.favourites_count
+      SQL
+    end
+  end
+
+  def up_slow
+    say 'Upsert is not available in PostgreSQL below 9.5, falling back to slow import of counters'
+
+    # We cannot use bulk INSERT or overarching transactions here because of possible
+    # uniqueness violations that we need to skip over
+    Status.unscoped.select('id, reblogs_count, favourites_count, created_at, updated_at').find_each do |status|
+      begin
+        params = [[nil, status.id], [nil, status.reblogs_count], [nil, status.favourites_count], [nil, status.created_at], [nil, status.updated_at]]
+        exec_insert('INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at) VALUES ($1, $2, $3, $4, $5)', nil, params)
+      rescue ActiveRecord::RecordNotUnique
+        next
+      end
+    end
+  end
 end
diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index 413a331c2..2f73711df 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -13,7 +13,7 @@ module Mastodon
     end
 
     def patch
-      0
+      2
     end
 
     def pre
diff --git a/lib/paperclip/lazy_thumbnail.rb b/lib/paperclip/lazy_thumbnail.rb
index ea675a5bf..542c17fb2 100644
--- a/lib/paperclip/lazy_thumbnail.rb
+++ b/lib/paperclip/lazy_thumbnail.rb
@@ -20,7 +20,7 @@ module Paperclip
     private
 
     def needs_convert?
-      needs_different_geometry? || needs_different_format?
+      needs_different_geometry? || needs_different_format? || needs_metadata_stripping?
     end
 
     def needs_different_geometry?
@@ -31,5 +31,9 @@ module Paperclip
     def needs_different_format?
       @format.present? && @current_format != @format
     end
+
+    def needs_metadata_stripping?
+      @attachment.instance.respond_to?(:local?) && @attachment.instance.local?
+    end
   end
 end
diff --git a/spec/controllers/concerns/signature_verification_spec.rb b/spec/controllers/concerns/signature_verification_spec.rb
index 3daf1fc4e..720690097 100644
--- a/spec/controllers/concerns/signature_verification_spec.rb
+++ b/spec/controllers/concerns/signature_verification_spec.rb
@@ -73,6 +73,30 @@ describe ApplicationController, type: :controller do
       end
     end
 
+    context 'with request older than a day' do
+      before do
+        get :success
+
+        fake_request = Request.new(:get, request.url)
+        fake_request.add_headers({ 'Date' => 2.days.ago.utc.httpdate })
+        fake_request.on_behalf_of(author)
+
+        request.headers.merge!(fake_request.headers)
+      end
+
+      describe '#signed_request?' do
+        it 'returns true' do
+          expect(controller.signed_request?).to be true
+        end
+      end
+
+      describe '#signed_request_account' do
+        it 'returns nil' do
+          expect(controller.signed_request_account).to be_nil
+        end
+      end
+    end
+
     context 'with body' do
       before do
         post :success, body: 'Hello world'