diff --git a/__tests__/components/AnnounceBanner.tsx b/__tests__/components/AnnounceBanner.tsx
index ef51e155d..8b9a8b8a6 100644
--- a/__tests__/components/AnnounceBanner.tsx
+++ b/__tests__/components/AnnounceBanner.tsx
@@ -71,7 +71,7 @@ describe('AnnounceBanner component', () => {
       'href',
       'https://nasa-gcn.github.io/gcn-presentation/'
     )
-    expect(link).toHaveAttribute('rel', 'external')
+    expect(link).toHaveAttribute('rel', 'external noopener')
   })
 })
 
diff --git a/app/components/ClientSampleCode.tsx b/app/components/ClientSampleCode.tsx
index 965c6f901..d9c078369 100644
--- a/app/components/ClientSampleCode.tsx
+++ b/app/components/ClientSampleCode.tsx
@@ -39,7 +39,8 @@ export function ClientSampleCode({
             Open a terminal and run this command to install with{' '}
             <Link
               className="usa-link"
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               href="https://pip.pypa.io/"
             >
               pip
@@ -51,7 +52,8 @@ export function ClientSampleCode({
             or this command to install with with{' '}
             <Link
               className="usa-link"
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               href="https://docs.conda.io/"
             >
               conda
@@ -118,7 +120,8 @@ export function ClientSampleCode({
             Open a terminal and run this command to install with{' '}
             <Link
               className="usa-link"
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               href="https://www.npmjs.com"
             >
               npm
@@ -201,7 +204,8 @@ export function ClientSampleCode({
             Open a terminal and run this command to install with{' '}
             <Link
               className="usa-link"
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               href="https://www.npmjs.com"
             >
               npm
@@ -286,7 +290,8 @@ export function ClientSampleCode({
             First,{' '}
             <Link
               className="usa-link"
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               href="https://github.com/edenhill/librdkafka#installation"
             >
               install librdkafka
@@ -540,14 +545,16 @@ export function ClientSampleCode({
             The following instructions are for the official Kafka command line
             tools which use Java and come with either{' '}
             <a
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               href="https://kafka.apache.org/documentation/#quickstart"
             >
               Apache Kafka
             </a>{' '}
             version 3.4.0 or newer or{' '}
             <a
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               href="https://docs.confluent.io/kafka/operations-tools/kafka-tools.html"
             >
               Confluent
diff --git a/app/components/NoticeFormat.tsx b/app/components/NoticeFormat.tsx
index 91f3f28dd..acf1789f6 100644
--- a/app/components/NoticeFormat.tsx
+++ b/app/components/NoticeFormat.tsx
@@ -48,7 +48,8 @@ export function NoticeFormatInput({
         <>
           VOEvent XML. See{' '}
           <a
-            rel="external"
+            rel="external noopener"
+            target="_blank"
             href="http://ivoa.net/Documents/latest/VOEvent.html"
           >
             documentation
@@ -64,7 +65,8 @@ export function NoticeFormatInput({
         <>
           160-byte binary format. Field packing is{' '}
           <a
-            rel="external"
+            rel="external noopener"
+            target="_blank"
             href="https://gcn.gsfc.nasa.gov/sock_pkt_def_doc.html"
           >
             specific to each notice type.
@@ -80,7 +82,11 @@ export function NoticeFormatInput({
             description: (
               <>
                 New notice types in JSON format defined using{' '}
-                <a href="https://json-schema.org" rel="external">
+                <a
+                  href="https://json-schema.org"
+                  rel="external noopener"
+                  target="_blank"
+                >
                   JSON schema
                 </a>
               </>
diff --git a/app/root/AnnounceBanner.tsx b/app/root/AnnounceBanner.tsx
index faf60919e..4eaeb2066 100644
--- a/app/root/AnnounceBanner.tsx
+++ b/app/root/AnnounceBanner.tsx
@@ -53,7 +53,8 @@ export default function AnnounceBanner({
             <p>
               If you cannot attend live, then you can get the{' '}
               <Link
-                rel="external"
+                rel="external noopener"
+                target="_blank"
                 href="https://nasa-gcn.github.io/gcn-presentation/"
               >
                 presentation
@@ -77,7 +78,7 @@ export function AnnouncementEvent(props: {
     <Grid mobileLg={{ col: 4 }}>
       {props.time}
       <div>(best for {props.region}):</div>
-      <Link rel="external" href={props.link}>
+      <Link rel="external noopener" target="_blank" href={props.link}>
         {props.linkstring}
       </Link>
     </Grid>
diff --git a/app/root/Footer.tsx b/app/root/Footer.tsx
index 6cf20bb4b..e535408be 100644
--- a/app/root/Footer.tsx
+++ b/app/root/Footer.tsx
@@ -95,27 +95,44 @@ export function Footer() {
         </IdentifierLogos>
         <IdentifierIdentity domain="gcn.nasa.gov">
           A service of the{' '}
-          <a rel="external" href="https://science.gsfc.nasa.gov/astrophysics/">
+          <a
+            rel="external noopener"
+            target="_blank"
+            href="https://science.gsfc.nasa.gov/astrophysics/"
+          >
             Astrophysics Science Division
           </a>{' '}
           at{' '}
-          <a rel="external" href="https://www.nasa.gov/">
+          <a
+            rel="external noopener"
+            target="_blank"
+            href="https://www.nasa.gov/"
+          >
             NASA
           </a>{' '}
-          <a rel="external" href="https://www.nasa.gov/goddard/">
+          <a
+            rel="external noopener"
+            target="_blank"
+            href="https://www.nasa.gov/goddard/"
+          >
             Goddard Space Flight Center
           </a>
         </IdentifierIdentity>
       </IdentifierMasthead>
       <IdentifierLinks navProps={{ 'aria-label': 'Important links' }}>
         <IdentifierLinkItem>
-          <IdentifierLink rel="external" href="https://www.nasa.gov/about/">
+          <IdentifierLink
+            rel="external noopener"
+            target="_blank"
+            href="https://www.nasa.gov/about/"
+          >
             About NASA
           </IdentifierLink>
         </IdentifierLinkItem>
         <IdentifierLinkItem>
           <IdentifierLink
-            rel="external"
+            rel="external noopener"
+            target="_blank"
             href="https://www.nasa.gov/general/accessibility/"
           >
             Accessibility
@@ -123,7 +140,8 @@ export function Footer() {
         </IdentifierLinkItem>
         <IdentifierLinkItem>
           <IdentifierLink
-            rel="external"
+            rel="external noopener"
+            target="_blank"
             href="https://www.nasa.gov/budgets-plans-and-reports/"
           >
             Budget and Performance
@@ -131,30 +149,44 @@ export function Footer() {
         </IdentifierLinkItem>
         <IdentifierLinkItem>
           <IdentifierLink
-            rel="external"
+            rel="external noopener"
+            target="_blank"
             href="https://www.nasa.gov/odeo/no-fear-act/"
           >
             No FEAR Act
           </IdentifierLink>
         </IdentifierLinkItem>
         <IdentifierLinkItem>
-          <IdentifierLink rel="external" href="https://www.nasa.gov/FOIA/">
+          <IdentifierLink
+            rel="external noopener"
+            target="_blank"
+            href="https://www.nasa.gov/FOIA/"
+          >
             FOIA Requests
           </IdentifierLink>
         </IdentifierLinkItem>
         <IdentifierLinkItem>
-          <IdentifierLink rel="external" href="https://oig.nasa.gov/">
+          <IdentifierLink
+            rel="external noopener"
+            target="_blank"
+            href="https://oig.nasa.gov/"
+          >
             Office of the Inspector General
           </IdentifierLink>
         </IdentifierLinkItem>
         <IdentifierLinkItem>
-          <IdentifierLink rel="external" href="https://www.nasa.gov/privacy/">
+          <IdentifierLink
+            rel="external noopener"
+            target="_blank"
+            href="https://www.nasa.gov/privacy/"
+          >
             Privacy Policy
           </IdentifierLink>
         </IdentifierLinkItem>
         <IdentifierLinkItem>
           <IdentifierLink
-            rel="external"
+            rel="external noopener"
+            target="_blank"
             href="https://www.nasa.gov/vulnerability-disclosure-policy/"
           >
             Vulnerability Disclosure Policy
@@ -163,7 +195,7 @@ export function Footer() {
       </IdentifierLinks>
       <IdentifierGov aria-label="U.S. government information and services">
         Looking for U.S. government information and services?{' '}
-        <a rel="external" href="https://www.usa.gov">
+        <a rel="external noopener" target="_blank" href="https://www.usa.gov">
           Visit USA.gov
         </a>
       </IdentifierGov>
diff --git a/app/routes/docs_._schema-browser.schema.($version).$/route.tsx b/app/routes/docs_._schema-browser.schema.($version).$/route.tsx
index e40ad6c4f..1e95bf395 100644
--- a/app/routes/docs_._schema-browser.schema.($version).$/route.tsx
+++ b/app/routes/docs_._schema-browser.schema.($version).$/route.tsx
@@ -252,7 +252,8 @@ function SchemaBody({
         View the source on{' '}
         <Link
           className="usa-link"
-          rel="external"
+          rel="external noopener"
+          target="_blank"
           to={`https://github.com/nasa-gcn/gcn-schema/blob/${selectedVersion}/${path}`}
         >
           GitHub
@@ -303,7 +304,8 @@ function SchemaBody({
             individually valid, based on their respective properties. See{' '}
             <Link
               className="usa-link"
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               to="https://json-schema.org/understanding-json-schema/reference/combining.html#allof"
             >
               allOf
@@ -323,7 +325,8 @@ function SchemaBody({
             individually valid based on their respective properties. See{' '}
             <Link
               className="usa-link"
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               to="https://json-schema.org/understanding-json-schema/reference/combining.html#anyof"
             >
               anyOf
@@ -343,7 +346,8 @@ function SchemaBody({
             individually valid based on their respective properties. See{' '}
             <Link
               className="usa-link"
-              rel="external"
+              rel="external noopener"
+              target="_blank"
               to="https://json-schema.org/understanding-json-schema/reference/combining.html#oneof"
             >
               oneOf
diff --git a/app/routes/user.email._index/route.tsx b/app/routes/user.email._index/route.tsx
index 402c08939..ac1d3f2d1 100644
--- a/app/routes/user.email._index/route.tsx
+++ b/app/routes/user.email._index/route.tsx
@@ -212,7 +212,11 @@ export default function () {
       <p className="usa-paragraph">
         Note that your preferenes here do not affect prior subscriptions on the
         old web site,{' '}
-        <a rel="external" href="https://gcn.gsfc.nasa.gov/">
+        <a
+          rel="external noopener"
+          target="_blank"
+          href="https://gcn.gsfc.nasa.gov/"
+        >
           https://gcn.gsfc.nasa.gov/
         </a>
         . To change your GCN Classic Notice subscriptions, please{' '}
diff --git a/app/routes/user.endorsements/route.tsx b/app/routes/user.endorsements/route.tsx
index 1a7515d55..ccf5dcb21 100644
--- a/app/routes/user.endorsements/route.tsx
+++ b/app/routes/user.endorsements/route.tsx
@@ -129,7 +129,11 @@ export default function () {
       </p>
       <p className="usa-paragraph">
         Peer endorsements (inspired by{' '}
-        <a rel="external" href="https://info.arxiv.org/help/endorsement.html">
+        <a
+          rel="external noopener"
+          target="_blank"
+          href="https://info.arxiv.org/help/endorsement.html"
+        >
           arXiv
         </a>
         ) help us to grow the GCN community sustainably while protecting the
diff --git a/package.json b/package.json
index cdbddbb78..fd85c58be 100644
--- a/package.json
+++ b/package.json
@@ -193,6 +193,12 @@
           "children": "never",
           "propElementValues": "always"
         }
+      ],
+      "react/jsx-no-target-blank": [
+        "error",
+        {
+          "allowReferrer": true
+        }
       ]
     },
     "overrides": [