diff --git a/models/activities/action.go b/models/activities/action.go
index f928ad6784..5067109545 100644
--- a/models/activities/action.go
+++ b/models/activities/action.go
@@ -26,6 +26,7 @@ import (
 	"forgejo.org/modules/base"
 	"forgejo.org/modules/container"
 	"forgejo.org/modules/git"
+	"forgejo.org/modules/json"
 	"forgejo.org/modules/log"
 	"forgejo.org/modules/setting"
 	"forgejo.org/modules/structs"
@@ -386,8 +387,21 @@ func (a *Action) IsIssueEvent() bool {
 
 // GetIssueInfos returns a list of associated information with the action.
 func (a *Action) GetIssueInfos() []string {
+	// Previously multiple pieces of data used to be encoded into a.Content by pipe-separating them, but this doesn't
+	// work well if some of the user-entered pieces of content (issue titles, comments, etc.) contain pipes.  The newer
+	// storage format is to json-encode a string array, which we check for and prefer... then fallback to assuming old.
+	var ret []string
+	if strings.HasPrefix(a.Content, "[") && strings.HasSuffix(a.Content, "]") {
+		ret = make([]string, 0, 3)
+		err := json.Unmarshal([]byte(a.Content), &ret)
+		if err != nil {
+			log.Error("GetIssueInfos json decoding error: %v", err)
+		}
+	} else {
+		ret = strings.SplitN(a.Content, "|", 3)
+	}
+
 	// make sure it always returns 3 elements, because there are some access to the a[1] and a[2] without checking the length
-	ret := strings.SplitN(a.Content, "|", 3)
 	for len(ret) < 3 {
 		ret = append(ret, "")
 	}
@@ -770,7 +784,9 @@ func DeleteIssueActions(ctx context.Context, repoID, issueID, issueIndex int64)
 
 	_, err := e.Where("repo_id = ?", repoID).
 		In("op_type", ActionCreateIssue, ActionCreatePullRequest).
-		Where("content LIKE ?", strconv.FormatInt(issueIndex, 10)+"|%"). // "IssueIndex|content..."
+		Where(builder.Or(
+			builder.Like{"content", strconv.FormatInt(issueIndex, 10) + "|%"},            // "IssueIndex|content..."
+			builder.Like{"content", "[\"" + strconv.FormatInt(issueIndex, 10) + "\"%"})). // JSON, ["IssueIndex"...
 		Delete(&Action{})
 	return err
 }
diff --git a/models/activities/action_test.go b/models/activities/action_test.go
index 161d05bbfa..6911733a09 100644
--- a/models/activities/action_test.go
+++ b/models/activities/action_test.go
@@ -308,14 +308,69 @@ func TestDeleteIssueActions(t *testing.T) {
 	})
 	require.NoError(t, err)
 	err = db.Insert(db.DefaultContext, &activities_model.Action{
-		OpType:  activities_model.ActionCreateIssue,
-		RepoID:  issue.RepoID,
+		OpType: activities_model.ActionCreateIssue,
+		RepoID: issue.RepoID,
+		// Older Content format...
 		Content: fmt.Sprintf("%d|content...", issue.Index),
 	})
 	require.NoError(t, err)
+	err = db.Insert(db.DefaultContext, &activities_model.Action{
+		OpType: activities_model.ActionCreateIssue,
+		RepoID: issue.RepoID,
+		// JSON-encoded Content format...
+		Content: fmt.Sprintf("[\"%d\",\"content...\"]", issue.Index),
+	})
+	require.NoError(t, err)
 
 	// assert that the actions exist, then delete them
-	unittest.AssertCount(t, &activities_model.Action{}, 2)
+	unittest.AssertCount(t, &activities_model.Action{}, 3)
 	require.NoError(t, activities_model.DeleteIssueActions(db.DefaultContext, issue.RepoID, issue.ID, issue.Index))
 	unittest.AssertCount(t, &activities_model.Action{}, 0)
 }
+
+func TestGetIssueInfos(t *testing.T) {
+	tt := []struct {
+		content string
+		field1  string
+		field2  string
+		field3  string
+	}{
+		{
+			content: "4|",
+			field1:  "4",
+		},
+		{
+			content: "2|docs: Add README w/ template sections",
+			field1:  "2",
+			field2:  "docs: Add README w/ template sections",
+		},
+		{
+			content: "2|docs: Add README w/ template sections|Some comment...",
+			field1:  "2",
+			field2:  "docs: Add README w/ template sections",
+			field3:  "Some comment...",
+		},
+		{
+			content: "[\"4\"]",
+			field1:  "4",
+		},
+		{
+			content: "[\"2\", \"docs: Add README w/ | template sections\"]",
+			field1:  "2",
+			field2:  "docs: Add README w/ | template sections",
+		},
+		{
+			content: "[\"2\", \"docs: Add README w/ | template sections\", \"Some | comment...\"]",
+			field1:  "2",
+			field2:  "docs: Add README w/ | template sections",
+			field3:  "Some | comment...",
+		},
+	}
+	for _, test := range tt {
+		action := &activities_model.Action{Content: test.content}
+		issueInfos := action.GetIssueInfos()
+		assert.Equal(t, test.field1, issueInfos[0])
+		assert.Equal(t, test.field2, issueInfos[1])
+		assert.Equal(t, test.field3, issueInfos[2])
+	}
+}
diff --git a/services/feed/action.go b/services/feed/action.go
index c708ae5404..e945e0905e 100644
--- a/services/feed/action.go
+++ b/services/feed/action.go
@@ -71,7 +71,7 @@ func (a *actionNotifier) NewIssue(ctx context.Context, issue *issues_model.Issue
 		ActUserID: issue.Poster.ID,
 		ActUser:   issue.Poster,
 		OpType:    activities_model.ActionCreateIssue,
-		Content:   fmt.Sprintf("%d|%s", issue.Index, issue.Title),
+		Content:   encodeContent(fmt.Sprintf("%d", issue.Index), issue.Title),
 		RepoID:    repo.ID,
 		Repo:      repo,
 		IsPrivate: repo.IsPrivate,
@@ -87,7 +87,7 @@ func (a *actionNotifier) IssueChangeStatus(ctx context.Context, doer *user_model
 	act := &activities_model.Action{
 		ActUserID: doer.ID,
 		ActUser:   doer,
-		Content:   fmt.Sprintf("%d|%s", issue.Index, ""),
+		Content:   encodeContent(fmt.Sprintf("%d", issue.Index), ""),
 		RepoID:    issue.Repo.ID,
 		Repo:      issue.Repo,
 		Comment:   actionComment,
@@ -135,7 +135,7 @@ func (a *actionNotifier) CreateIssueComment(ctx context.Context, doer *user_mode
 			truncatedContent = truncatedContent[:lastSpaceIdx] + "…"
 		}
 	}
-	act.Content = fmt.Sprintf("%d|%s", issue.Index, truncatedContent)
+	act.Content = encodeContent(fmt.Sprintf("%d", issue.Index), truncatedContent)
 
 	if issue.IsPull {
 		act.OpType = activities_model.ActionCommentPull
@@ -167,7 +167,7 @@ func (a *actionNotifier) NewPullRequest(ctx context.Context, pull *issues_model.
 		ActUserID: pull.Issue.Poster.ID,
 		ActUser:   pull.Issue.Poster,
 		OpType:    activities_model.ActionCreatePullRequest,
-		Content:   fmt.Sprintf("%d|%s", pull.Issue.Index, pull.Issue.Title),
+		Content:   encodeContent(fmt.Sprintf("%d", pull.Issue.Index), pull.Issue.Title),
 		RepoID:    pull.Issue.Repo.ID,
 		Repo:      pull.Issue.Repo,
 		IsPrivate: pull.Issue.Repo.IsPrivate,
@@ -247,7 +247,7 @@ func (a *actionNotifier) PullRequestReview(ctx context.Context, pr *issues_model
 				actions = append(actions, &activities_model.Action{
 					ActUserID: review.Reviewer.ID,
 					ActUser:   review.Reviewer,
-					Content:   fmt.Sprintf("%d|%s", review.Issue.Index, strings.Split(comm.Content, "\n")[0]),
+					Content:   encodeContent(fmt.Sprintf("%d", review.Issue.Index), strings.Split(comm.Content, "\n")[0]),
 					OpType:    activities_model.ActionCommentPull,
 					RepoID:    review.Issue.RepoID,
 					Repo:      review.Issue.Repo,
@@ -263,7 +263,7 @@ func (a *actionNotifier) PullRequestReview(ctx context.Context, pr *issues_model
 		action := &activities_model.Action{
 			ActUserID: review.Reviewer.ID,
 			ActUser:   review.Reviewer,
-			Content:   fmt.Sprintf("%d|%s", review.Issue.Index, strings.Split(comment.Content, "\n")[0]),
+			Content:   encodeContent(fmt.Sprintf("%d", review.Issue.Index), strings.Split(comment.Content, "\n")[0]),
 			RepoID:    review.Issue.RepoID,
 			Repo:      review.Issue.Repo,
 			IsPrivate: review.Issue.Repo.IsPrivate,
@@ -293,7 +293,7 @@ func (*actionNotifier) MergePullRequest(ctx context.Context, doer *user_model.Us
 		ActUserID: doer.ID,
 		ActUser:   doer,
 		OpType:    activities_model.ActionMergePullRequest,
-		Content:   fmt.Sprintf("%d|%s", pr.Issue.Index, pr.Issue.Title),
+		Content:   encodeContent(fmt.Sprintf("%d", pr.Issue.Index), pr.Issue.Title),
 		RepoID:    pr.Issue.Repo.ID,
 		Repo:      pr.Issue.Repo,
 		IsPrivate: pr.Issue.Repo.IsPrivate,
@@ -307,7 +307,7 @@ func (*actionNotifier) AutoMergePullRequest(ctx context.Context, doer *user_mode
 		ActUserID: doer.ID,
 		ActUser:   doer,
 		OpType:    activities_model.ActionAutoMergePullRequest,
-		Content:   fmt.Sprintf("%d|%s", pr.Issue.Index, pr.Issue.Title),
+		Content:   encodeContent(fmt.Sprintf("%d", pr.Issue.Index), pr.Issue.Title),
 		RepoID:    pr.Issue.Repo.ID,
 		Repo:      pr.Issue.Repo,
 		IsPrivate: pr.Issue.Repo.IsPrivate,
@@ -325,7 +325,7 @@ func (*actionNotifier) NotifyPullRevieweDismiss(ctx context.Context, doer *user_
 		ActUserID: doer.ID,
 		ActUser:   doer,
 		OpType:    activities_model.ActionPullReviewDismissed,
-		Content:   fmt.Sprintf("%d|%s|%s", review.Issue.Index, reviewerName, comment.Content),
+		Content:   encodeContent(fmt.Sprintf("%d", review.Issue.Index), reviewerName, comment.Content),
 		RepoID:    review.Issue.Repo.ID,
 		Repo:      review.Issue.Repo,
 		IsPrivate: review.Issue.Repo.IsPrivate,
@@ -482,3 +482,12 @@ func (a *actionNotifier) NewRelease(ctx context.Context, rel *repo_model.Release
 		log.Error("NotifyWatchers: %v", err)
 	}
 }
+
+// ... later decoded in models/activities/action.go:GetIssueInfos
+func encodeContent(params ...string) string {
+	contentEncoded, err := json.Marshal(params)
+	if err != nil {
+		log.Error("encodeContent: Unexpected json encoding error: %v", err)
+	}
+	return string(contentEncoded)
+}
diff --git a/tests/integration/feed_user_test.go b/tests/integration/feed_user_test.go
index dfcb33b35d..c914e15f69 100644
--- a/tests/integration/feed_user_test.go
+++ b/tests/integration/feed_user_test.go
@@ -76,6 +76,7 @@ func TestFeed(t *testing.T) {
 				data := resp.Body.String()
 				assert.Contains(t, data, `<feed xmlns="http://www.w3.org/2005/Atom"`)
 				assert.Contains(t, data, "This is a very long text, so lets scream together: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
+				assert.Contains(t, data, "Well, this test is short | succient | distinct.")
 			})
 			t.Run("RSS", func(t *testing.T) {
 				defer tests.PrintCurrentTest(t)()
@@ -86,6 +87,7 @@ func TestFeed(t *testing.T) {
 				data := resp.Body.String()
 				assert.Contains(t, data, `<rss version="2.0"`)
 				assert.Contains(t, data, "This is a very long text, so lets scream together: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
+				assert.Contains(t, data, "Well, this test is short | succient | distinct.")
 			})
 		})
 		t.Run("Branch", func(t *testing.T) {
diff --git a/tests/integration/fixtures/TestFeed/action.yml b/tests/integration/fixtures/TestFeed/action.yml
index c00e4bcc59..9b7453b4ad 100644
--- a/tests/integration/fixtures/TestFeed/action.yml
+++ b/tests/integration/fixtures/TestFeed/action.yml
@@ -7,3 +7,12 @@
   is_private: false
   created_unix: 1680454039
   content: '1|This is a very long text, so lets scream together: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa…'
+- id: 1002
+  user_id: 2
+  op_type: 10 # close issue
+  act_user_id: 2
+  comment_id: 1001
+  repo_id: 1 # public
+  is_private: false
+  created_unix: 1680454039
+  content: '["1","Well, this test is short | succient | distinct."]'
diff --git a/tests/integration/user_dashboard_test.go b/tests/integration/user_dashboard_test.go
index b18f96c090..d6ef1736d0 100644
--- a/tests/integration/user_dashboard_test.go
+++ b/tests/integration/user_dashboard_test.go
@@ -87,3 +87,38 @@ func TestDashboardTitleRendering(t *testing.T) {
 		assert.Equal(t, 6, count)
 	})
 }
+
+func TestDashboardActionEscaping(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, u *url.URL) {
+		user4 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 4})
+		sess := loginUser(t, user4.Name)
+
+		repo, _, f := tests.CreateDeclarativeRepo(t, user4, "",
+			[]unit_model.Type{unit_model.TypePullRequests, unit_model.TypeIssues}, nil,
+			[]*files_service.ChangeRepoFile{},
+		)
+		defer f()
+
+		issue := createIssue(t, user4, repo, "Issue with | in title", "Hey here's a | for you")
+
+		_, err := issue_service.CreateIssueComment(db.DefaultContext, user4, repo, issue, "Comment with a | in it", nil)
+		require.NoError(t, err)
+
+		testIssueClose(t, sess, repo.OwnerName, repo.Name, strconv.Itoa(int(issue.Index)), false)
+
+		response := sess.MakeRequest(t, NewRequest(t, "GET", "/"), http.StatusOK)
+		htmlDoc := NewHTMLParser(t, response.Body)
+
+		count := 0
+		htmlDoc.doc.Find("#activity-feed .flex-item-main .title").Each(func(i int, s *goquery.Selection) {
+			count++
+			assert.Equal(t, "Issue with | in title", s.Text())
+		})
+		htmlDoc.doc.Find("#activity-feed .flex-item-main .markup").Each(func(i int, s *goquery.Selection) {
+			count++
+			assert.Equal(t, "Comment with a | in it\n", s.Text())
+		})
+
+		assert.Equal(t, 4, count)
+	})
+}