diff --git a/x-pack/plugins/security/server/config_deprecations.test.ts b/x-pack/plugins/security/server/config_deprecations.test.ts
index 0989008c9f932..2c916e475a495 100644
--- a/x-pack/plugins/security/server/config_deprecations.test.ts
+++ b/x-pack/plugins/security/server/config_deprecations.test.ts
@@ -54,11 +54,11 @@ describe('Config Deprecations', () => {
       Array [
         Object {
           "level": "warning",
-          "message": "The session idle timeout will default to 1 hour in 8.0.",
+          "message": "User sessions will automatically time out after 8 hours of inactivity starting in 8.0. Override this value to change the timeout.",
         },
         Object {
           "level": "warning",
-          "message": "The session lifespan will default to 30 days in 8.0.",
+          "message": "Users are automatically required to log in again after 30 days starting in 8.0. Override this value to change the timeout.",
         },
       ]
     `);
@@ -72,7 +72,7 @@ describe('Config Deprecations', () => {
       Array [
         Object {
           "level": "warning",
-          "message": "The session idle timeout will default to 1 hour in 8.0.",
+          "message": "User sessions will automatically time out after 8 hours of inactivity starting in 8.0. Override this value to change the timeout.",
         },
       ]
     `);
@@ -86,7 +86,7 @@ describe('Config Deprecations', () => {
       Array [
         Object {
           "level": "warning",
-          "message": "The session lifespan will default to 30 days in 8.0.",
+          "message": "Users are automatically required to log in again after 30 days starting in 8.0. Override this value to change the timeout.",
         },
       ]
     `);
@@ -111,7 +111,7 @@ describe('Config Deprecations', () => {
         },
         Object {
           "level": "warning",
-          "message": "The session lifespan will default to 30 days in 8.0.",
+          "message": "Users are automatically required to log in again after 30 days starting in 8.0. Override this value to change the timeout.",
         },
       ]
     `);
diff --git a/x-pack/plugins/security/server/config_deprecations.ts b/x-pack/plugins/security/server/config_deprecations.ts
index ea9377f6a74a5..b867c50f589e0 100644
--- a/x-pack/plugins/security/server/config_deprecations.ts
+++ b/x-pack/plugins/security/server/config_deprecations.ts
@@ -225,25 +225,25 @@ export const securityConfigDeprecationProvider: ConfigDeprecationProvider = ({
     }
   },
   // Default values for session expiration timeouts.
-  (settings, fromPath, addDeprecation, { branch }) => {
+  (settings, fromPath, addDeprecation) => {
     if (settings?.xpack?.security?.session?.idleTimeout === undefined) {
       addDeprecation({
         configPath: 'xpack.security.session.idleTimeout',
         level: 'warning',
         title: i18n.translate('xpack.security.deprecations.idleTimeoutTitle', {
-          defaultMessage: 'The "xpack.security.session.idleTimeout" default is changing',
+          defaultMessage: '"xpack.security.session.idleTimeout" is now 8 hours',
         }),
         message: i18n.translate('xpack.security.deprecations.idleTimeoutMessage', {
-          defaultMessage: 'The session idle timeout will default to 1 hour in 8.0.',
+          defaultMessage:
+            'User sessions will automatically time out after 8 hours of inactivity starting in 8.0. Override this value to change the timeout.',
         }),
-        documentationUrl: `https://www.elastic.co/guide/en/kibana/${branch}/xpack-security-session-management.html#session-idle-timeout`,
         correctiveActions: {
           manualSteps: [
             i18n.translate('xpack.security.deprecations.idleTimeout.manualStepOneMessage', {
-              defaultMessage: `Set "xpack.security.session.idleTimeout" in your Kibana configuration to override the default session idle timeout.`,
-            }),
-            i18n.translate('xpack.security.deprecations.idleTimeout.manualStepTwoMessage', {
-              defaultMessage: `To disable the session idle timeout, set "xpack.security.session.idleTimeout" to 0.`,
+              defaultMessage:
+                'To configure a custom timeout, set "xpack.security.session.idleTimeout". Use the format <count>⁠[ms|s|m|h|d|w|M|Y], for example, 20m, 24h, 7d, 1w. A value of 0 disables the timeout.',
+              description:
+                'Please preserve a Word Joiner (U+2060) symbol after <count> in translation.',
             }),
           ],
         },
@@ -255,19 +255,19 @@ export const securityConfigDeprecationProvider: ConfigDeprecationProvider = ({
         configPath: 'xpack.security.session.lifespan',
         level: 'warning',
         title: i18n.translate('xpack.security.deprecations.lifespanTitle', {
-          defaultMessage: 'The "xpack.security.session.lifespan" default is changing',
+          defaultMessage: '"xpack.security.session.lifespan" is now 30 days',
         }),
         message: i18n.translate('xpack.security.deprecations.lifespanMessage', {
-          defaultMessage: 'The session lifespan will default to 30 days in 8.0.',
+          defaultMessage:
+            'Users are automatically required to log in again after 30 days starting in 8.0. Override this value to change the timeout.',
         }),
-        documentationUrl: `https://www.elastic.co/guide/en/kibana/${branch}/xpack-security-session-management.html#session-lifespan`,
         correctiveActions: {
           manualSteps: [
             i18n.translate('xpack.security.deprecations.lifespan.manualStepOneMessage', {
-              defaultMessage: `Set "xpack.security.session.lifespan" in your Kibana configuration to override the default session lifespan.`,
-            }),
-            i18n.translate('xpack.security.deprecations.lifespan.manualStepTwoMessage', {
-              defaultMessage: `To disable the session lifespan, set "xpack.security.session.lifespan" to 0.`,
+              defaultMessage:
+                'To configure a custom timeout, set "xpack.security.session.lifespan". Use the format <count>⁠[ms|s|m|h|d|w|M|Y], for example, 20m, 24h, 7d, 1w. A value of 0 disables the timeout.',
+              description:
+                'Please preserve a Word Joiner (U+2060) symbol after <count> in translation.',
             }),
           ],
         },