diff --git a/openreview/arr/arr.py b/openreview/arr/arr.py
index aec01a931..8b43dea22 100644
--- a/openreview/arr/arr.py
+++ b/openreview/arr/arr.py
@@ -855,6 +855,7 @@ def create_bid_stages(self):
 
     def create_comment_stage(self):
         self.venue.comment_stage = self.comment_stage
+        self.venue.comment_stage.preprocess_path = '../arr/process/comment_pre_process.js'
         self.venue.comment_stage.process_path = '../arr/process/comment_process.py'
         return self.venue.create_comment_stage()
 
diff --git a/openreview/arr/process/comment_pre_process.js b/openreview/arr/process/comment_pre_process.js
new file mode 100644
index 000000000..732ad1730
--- /dev/null
+++ b/openreview/arr/process/comment_pre_process.js
@@ -0,0 +1,129 @@
+async function process(client, edit, invitation) {
+  client.throwErrors = true
+
+  const { note } = edit
+  if (note.ddate) {
+    return
+  }
+
+  const [res1, res2] = await Promise.all([
+    client.getNotes({ id: note.forum }),
+    client.getGroups({ id: invitation.domain }),
+  ])
+  const forum = res1.notes[0]
+  const domain = res2.groups[0]
+  const readers = note.readers || []
+  const authorsName = domain.content?.authors_name?.value || "Authors"
+  const authorGroupId = `${domain.id}/Submission${forum.number}/${authorsName}`
+  const commentText = note.content?.comment?.value || ""
+
+  function containsLink(text) {
+    const tokenChecks = [
+      ["includes", ["http://", "https://", "www."]]
+    ]
+    const popularDomainSuffixes = [
+      ".com",
+      ".net",
+      ".org",
+      ".io",
+      ".co",
+      ".tv",
+      ".cn",
+      ".de",
+      ".uk",
+      ".ru",
+      ".nl",
+      ".br"
+    ]
+    const boundaryChars = "<>()[]{}.,;:!?\"'"
+    let lowerText = String(text || "").toLowerCase()
+
+    for (const whitespace of ["\n", "\r", "\t"]) {
+      lowerText = lowerText.split(whitespace).join(" ")
+    }
+
+    function trimToken(token) {
+      let start = 0
+      let end = token.length
+      while (start < end && boundaryChars.includes(token[start])) {
+        start += 1
+      }
+      while (end > start && boundaryChars.includes(token[end - 1])) {
+        end -= 1
+      }
+      return token.slice(start, end)
+    }
+
+    function matches(value, checks) {
+      for (const [operation, parts] of checks) {
+        for (const part of parts) {
+          if (value[operation](part)) {
+            return true
+          }
+        }
+      }
+      return false
+    }
+
+    for (const rawToken of lowerText.split(" ")) {
+      const token = trimToken(rawToken)
+      // Skip empty tokens, emails, and tokens that cannot be hostnames.
+      if (!token || token.includes("@") || !token.includes(".")) {
+        continue
+      }
+      // Return early for explicit URL schemes and common www-style hosts.
+      if (matches(token, tokenChecks)) {
+        return true
+      }
+
+      // Trim the token to a host-like prefix before matching common web suffixes.
+      let host = token
+      for (const separator of ["/", "?", "#", ":"]) {
+        const index = host.indexOf(separator)
+        if (index !== -1) {
+          host = host.slice(0, index)
+        }
+      }
+      host = trimToken(host)
+
+      // Match hosts that end in one of the common web suffixes.
+      const firstDot = host.indexOf(".")
+      if (firstDot > 0 && firstDot < host.length - 1) {
+        for (const suffix of popularDomainSuffixes) {
+          if (host.endsWith(suffix)) {
+            return true
+          }
+        }
+      }
+    }
+
+    return false
+  }
+
+  if ((readers.includes(authorGroupId) || readers.includes("everyone")) && containsLink(commentText)) {
+    return Promise.reject(
+      new OpenReviewError({
+        name: "Error",
+        message: "Links are not allowed in official comments that are visible to authors.",
+      })
+    )
+  }
+
+  if (readers.includes("everyone")) {
+    return
+  }
+
+  const commentMandatoryReaders =
+    domain.content?.comment_mandatory_readers?.value || []
+  for (const m of commentMandatoryReaders) {
+    const reader = m.replace("{number}", forum.number)
+    if (!readers.includes(reader)) {
+      return Promise.reject(
+        new OpenReviewError({
+          name: "Error",
+          message: reader + " must be readers of the comment",
+        })
+      )
+    }
+  }
+}
diff --git a/tests/test_arr_venue_v2.py b/tests/test_arr_venue_v2.py
index 790d96d3a..6f200040d 100644
--- a/tests/test_arr_venue_v2.py
+++ b/tests/test_arr_venue_v2.py
@@ -5327,6 +5327,183 @@ def test_author_response(self, client, openreview_client, helpers, test_client,
         reviewer_client = openreview.api.OpenReviewClient(username = 'reviewer2@aclrollingreview.com', password=helpers.strong_password)
         anon_id = reviewer_client.get_groups(prefix=f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Reviewer_', signatory='~Reviewer_ARRTwo1')[0].id
         ac_client = openreview.api.OpenReviewClient(username = 'ac1@aclrollingreview.com', password=helpers.strong_password)
+
+        with pytest.raises(openreview.OpenReviewException, match=r'Links are not allowed in official comments that are visible to authors.'):
+            reviewer_client.post_note_edit(
+                invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/-/Official_Comment",
+                writers=['aclweb.org/ACL/ARR/2023/August'],
+                signatures=[anon_id],
+                note=openreview.api.Note(
+                    replyto=submissions[1].id,
+                    readers=[
+                        'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Senior_Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Reviewers',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'
+                    ],
+                    content={
+                        "comment": { "value": "Please see https://example.com/details for more information."}
+                    }
+                )
+            )
+
+        with pytest.raises(openreview.OpenReviewException, match=r'Links are not allowed in official comments that are visible to authors.'):
+            test_client.post_note_edit(
+                invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/-/Official_Comment",
+                writers=['aclweb.org/ACL/ARR/2023/August'],
+                signatures=[f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'],
+                note=openreview.api.Note(
+                    replyto=submissions[1].id,
+                    readers=[
+                        'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Senior_Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Reviewers',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'
+                    ],
+                    content={
+                        "comment": { "value": "Please see [this note](https://example.com/details)." }
+                    }
+                )
+            )
+
+        with pytest.raises(openreview.OpenReviewException, match=r'Links are not allowed in official comments that are visible to authors.'):
+            test_client.post_note_edit(
+                invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/-/Official_Comment",
+                writers=['aclweb.org/ACL/ARR/2023/August'],
+                signatures=[f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'],
+                note=openreview.api.Note(
+                    replyto=submissions[1].id,
+                    readers=[
+                        'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Senior_Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Reviewers',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'
+                    ],
+                    content={
+                        "comment": { "value": "Please see www.example.com for more information." }
+                    }
+                )
+            )
+
+        with pytest.raises(openreview.OpenReviewException, match=r'Links are not allowed in official comments that are visible to authors.'):
+            test_client.post_note_edit(
+                invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/-/Official_Comment",
+                writers=['aclweb.org/ACL/ARR/2023/August'],
+                signatures=[f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'],
+                note=openreview.api.Note(
+                    replyto=submissions[1].id,
+                    readers=[
+                        'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Senior_Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Reviewers',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'
+                    ],
+                    content={
+                        "comment": { "value": "Please see example.com for more information." }
+                    }
+                )
+            )
+
+        with pytest.raises(openreview.OpenReviewException, match=r'Links are not allowed in official comments that are visible to authors.'):
+            test_client.post_note_edit(
+                invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/-/Official_Comment",
+                writers=['aclweb.org/ACL/ARR/2023/August'],
+                signatures=[f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'],
+                note=openreview.api.Note(
+                    replyto=submissions[1].id,
+                    readers=[
+                        'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Senior_Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Reviewers',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'
+                    ],
+                    content={
+                        "comment": { "value": "Please see example.co.uk for more information." }
+                    }
+                )
+            )
+
+        comment_edit = pc_client_v2.post_note_edit(
+            invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/-/Official_Comment",
+            writers=['aclweb.org/ACL/ARR/2023/August'],
+            signatures=['aclweb.org/ACL/ARR/2023/August/Program_Chairs'],
+            note=openreview.api.Note(
+                replyto=submissions[0].id,
+                readers=[
+                    'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                    f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/Senior_Area_Chairs',
+                    f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/Area_Chairs',
+                    f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/Authors'
+                ],
+                content={
+                    "comment": { "value": "Please email pc@example.com for more information." }
+                }
+            )
+        )
+        helpers.await_queue_edit(openreview_client, edit_id=comment_edit['id'])
+
+        comment_edit = pc_client_v2.post_note_edit(
+            invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/-/Official_Comment",
+            writers=['aclweb.org/ACL/ARR/2023/August'],
+            signatures=['aclweb.org/ACL/ARR/2023/August/Program_Chairs'],
+            note=openreview.api.Note(
+                replyto=submissions[0].id,
+                readers=[
+                    'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                    f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/Senior_Area_Chairs',
+                    f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/Area_Chairs',
+                    f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/Authors'
+                ],
+                content={
+                    "comment": { "value": "Please see example.museum for more information." }
+                }
+            )
+        )
+        helpers.await_queue_edit(openreview_client, edit_id=comment_edit['id'])
+
+        with pytest.raises(openreview.OpenReviewException, match=r'Links are not allowed in official comments that are visible to authors.'):
+            test_client.post_note_edit(
+                invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/-/Official_Comment",
+                writers=['aclweb.org/ACL/ARR/2023/August'],
+                signatures=[f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'],
+                note=openreview.api.Note(
+                    replyto=submissions[1].id,
+                    readers=[
+                        'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Senior_Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Area_Chairs',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Reviewers',
+                        f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors'
+                    ],
+                    content={
+                        "comment": { "value": "Please see example.io for more information." }
+                    }
+                )
+            )
+
+        comment_edit = pc_client_v2.post_note_edit(
+            invitation=f"aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/-/Official_Comment",
+            writers=['aclweb.org/ACL/ARR/2023/August'],
+            signatures=['aclweb.org/ACL/ARR/2023/August/Program_Chairs'],
+            note=openreview.api.Note(
+                replyto=submissions[0].id,
+                readers=[
+                    'aclweb.org/ACL/ARR/2023/August/Program_Chairs',
+                    f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/Senior_Area_Chairs',
+                    f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[0].number}/Area_Chairs'
+                ],
+                content={
+                    "comment": { "value": "Internal discussion: https://example.com/internal-doc" }
+                }
+            )
+        )
+        helpers.await_queue_edit(openreview_client, edit_id=comment_edit['id'])
+
         clients = [reviewer_client, test_client]
         signatures = [anon_id, f'aclweb.org/ACL/ARR/2023/August/Submission{submissions[1].number}/Authors']
         root_note_id = None