diff --git a/projects/plugins/jetpack/changelog/fix-cookie-consent-block-color-fallback b/projects/plugins/jetpack/changelog/fix-cookie-consent-block-color-fallback
new file mode 100644
index 0000000000000..89e061917d063
--- /dev/null
+++ b/projects/plugins/jetpack/changelog/fix-cookie-consent-block-color-fallback
@@ -0,0 +1,4 @@
+Significance: patch
+Type: compat
+
+Cookie Consent Block: ensure we always have a default set of colors to style the block when theme colors are not available.
diff --git a/projects/plugins/jetpack/extensions/blocks/cookie-consent/block.json b/projects/plugins/jetpack/extensions/blocks/cookie-consent/block.json
index a14198fd9eb28..6553a6e2ee9db 100644
--- a/projects/plugins/jetpack/extensions/blocks/cookie-consent/block.json
+++ b/projects/plugins/jetpack/extensions/blocks/cookie-consent/block.json
@@ -38,9 +38,9 @@
 			"type": "object",
 			"default": {
 				"color": {
-					"text": "var(--wp--preset--color--contrast)",
-					"background": "var(--wp--preset--color--tertiary)",
-					"link": "var(--wp--preset--color--contrast)"
+					"text": "var(--wp--preset--color--contrast, #000000)",
+					"background": "var(--wp--preset--color--tertiary, #f0f0f0)",
+					"link": "var(--wp--preset--color--contrast, #000000)"
 				},
 				"spacing": {
 					"padding": {
diff --git a/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.html b/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.html
index 7157efb923474..c5ed189802d88 100644
--- a/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.html
+++ b/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.html
@@ -1,5 +1,5 @@
 <!-- wp:jetpack/cookie-consent -->
-<div class="wp-block-jetpack-cookie-consent alignwide has-text-color has-background has-text-color has-background" style="color:var(--wp--preset--color--contrast);background-color:var(--wp--preset--color--tertiary);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em" role="dialog" aria-modal="true"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href="https://automattic.com/cookies/">Cookie Policy</a>.</p><!-- wp:button -->
+<div class="wp-block-jetpack-cookie-consent alignwide has-text-color has-background has-text-color has-background" style="color:var(--wp--preset--color--contrast, #000000);background-color:var(--wp--preset--color--tertiary, #f0f0f0);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em" role="dialog" aria-modal="true"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href="https://automattic.com/cookies/">Cookie Policy</a>.</p><!-- wp:button -->
 	<div class="wp-block-button"><a class="wp-block-button__link wp-element-button">Accept</a></div>
 	<!-- /wp:button --><span>365</span></div>
 <!-- /wp:jetpack/cookie-consent -->
diff --git a/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.json b/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.json
index 6b9feaf656ccb..9b7c3bab9b4a7 100644
--- a/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.json
+++ b/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.json
@@ -7,9 +7,9 @@
 			"text": "Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href=\"https://automattic.com/cookies/\">Cookie Policy</a>.",
 			"style": {
 				"color": {
-					"text": "var(--wp--preset--color--contrast)",
-					"background": "var(--wp--preset--color--tertiary)",
-					"link": "var(--wp--preset--color--contrast)"
+					"text": "var(--wp--preset--color--contrast, #000000)",
+					"background": "var(--wp--preset--color--tertiary, #f0f0f0)",
+					"link": "var(--wp--preset--color--contrast, #000000)"
 				},
 				"spacing": {
 					"padding": {
@@ -25,6 +25,6 @@
 			"showOverlay": false
 		},
 		"innerBlocks": [],
-		"originalContent": "<div class=\"wp-block-jetpack-cookie-consent alignwide has-text-color has-background has-text-color has-background\" style=\"color:var(--wp--preset--color--contrast);background-color:var(--wp--preset--color--tertiary);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em\" role=\"dialog\" aria-modal=\"true\"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href=\"https://automattic.com/cookies/\">Cookie Policy</a>.</p><span>365</span></div>"
+		"originalContent": "<div class=\"wp-block-jetpack-cookie-consent alignwide has-text-color has-background has-text-color has-background\" style=\"color:var(--wp--preset--color--contrast, #000000);background-color:var(--wp--preset--color--tertiary, #f0f0f0);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em\" role=\"dialog\" aria-modal=\"true\"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href=\"https://automattic.com/cookies/\">Cookie Policy</a>.</p><span>365</span></div>"
 	}
 ]
diff --git a/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.parsed.json b/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.parsed.json
index 3f07a877f9351..98568006b43de 100644
--- a/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.parsed.json
+++ b/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.parsed.json
@@ -13,9 +13,9 @@
 				]
 			}
 		],
-		"innerHTML": "\n<div class=\"wp-block-jetpack-cookie-consent alignwide has-text-color has-background has-text-color has-background\" style=\"color:var(--wp--preset--color--contrast);background-color:var(--wp--preset--color--tertiary);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em\" role=\"dialog\" aria-modal=\"true\"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href=\"https://automattic.com/cookies/\">Cookie Policy</a>.</p><span>365</span></div>\n",
+		"innerHTML": "\n<div class=\"wp-block-jetpack-cookie-consent alignwide has-text-color has-background has-text-color has-background\" style=\"color:var(--wp--preset--color--contrast, #000000);background-color:var(--wp--preset--color--tertiary, #f0f0f0);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em\" role=\"dialog\" aria-modal=\"true\"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href=\"https://automattic.com/cookies/\">Cookie Policy</a>.</p><span>365</span></div>\n",
 		"innerContent": [
-			"\n<div class=\"wp-block-jetpack-cookie-consent alignwide has-text-color has-background has-text-color has-background\" style=\"color:var(--wp--preset--color--contrast);background-color:var(--wp--preset--color--tertiary);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em\" role=\"dialog\" aria-modal=\"true\"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href=\"https://automattic.com/cookies/\">Cookie Policy</a>.</p>",
+			"\n<div class=\"wp-block-jetpack-cookie-consent alignwide has-text-color has-background has-text-color has-background\" style=\"color:var(--wp--preset--color--contrast, #000000);background-color:var(--wp--preset--color--tertiary, #f0f0f0);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em\" role=\"dialog\" aria-modal=\"true\"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href=\"https://automattic.com/cookies/\">Cookie Policy</a>.</p>",
 			null,
 			"<span>365</span></div>\n"
 		]
diff --git a/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.serialized.html b/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.serialized.html
index 8df88b124fd00..81aaeca454298 100644
--- a/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.serialized.html
+++ b/projects/plugins/jetpack/extensions/blocks/cookie-consent/test/fixtures/jetpack__cookie-consent.serialized.html
@@ -1,3 +1,3 @@
 <!-- wp:jetpack/cookie-consent -->
-<div class="wp-block-jetpack-cookie-consent alignwide has-text-color has-background" style="color:var(--wp--preset--color--contrast);background-color:var(--wp--preset--color--tertiary);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em" role="dialog" aria-modal="true"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href="https://automattic.com/cookies/">Cookie Policy</a>.</p><span>365</span></div>
+<div class="wp-block-jetpack-cookie-consent alignwide has-text-color has-background" style="color:var(--wp--preset--color--contrast, #000000);background-color:var(--wp--preset--color--tertiary, #f0f0f0);padding-top:1em;padding-right:1em;padding-bottom:1em;padding-left:1em" role="dialog" aria-modal="true"><p>Privacy &amp; Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: <a href="https://automattic.com/cookies/">Cookie Policy</a>.</p><span>365</span></div>
 <!-- /wp:jetpack/cookie-consent -->