From 3dff7c8c7a04a413437f2f09e3a1252ae6f1be92 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Bj=C3=B8rn=20Erik=20Pedersen?=
 <bjorn.erik.pedersen@gmail.com>
Date: Wed, 25 Feb 2026 17:35:20 +0100
Subject: [PATCH] Fix menu pageRef resolution in multidimensional setups

Fixes #14566
---
 hugolib/menu_test.go | 34 ++++++++++++++++++++++++++++++++++
 hugolib/site.go      |  8 ++++++--
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/hugolib/menu_test.go b/hugolib/menu_test.go
index 2b9e5d9fb..20d862caa 100644
--- a/hugolib/menu_test.go
+++ b/hugolib/menu_test.go
@@ -604,6 +604,40 @@ title: p3
 	b.AssertFileContent("public/index.html", `<a href="/s1/p2/">p2</a><a href="/s1/">s1</a>`)
 }
 
+// Issue 14566
+func TestMenusPageRefSitesMatrix(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+baseURL = "http://example.com/"
+defaultContentVersionInSubdir = true
+[versions]
+[versions.v1]
+[versions.v2]
+
+[[menus.main]]
+name = "Home"
+pageRef = "/"
+weight = 1
+
+-- layouts/home.html --
+{{ range .Site.Menus.main }}
+{{ .Name }}|{{ .URL }}|{{ .Page.Path }}|{{ .Page.Site.Version.Name }}
+{{ end }}
+`
+
+	b := Test(t, files)
+
+	b.AssertFileContent("public/v1/index.html", `
+Home|/v1/|/|v1
+`)
+
+	b.AssertFileContent("public/v2/index.html", `
+Home|/v2/|/|v2
+`)
+}
+
 // Issue 13161
 func TestMenuNameAndTitleFallback(t *testing.T) {
 	t.Parallel()
diff --git a/hugolib/site.go b/hugolib/site.go
index 94e4cf566..07fe41d2a 100644
--- a/hugolib/site.go
+++ b/hugolib/site.go
@@ -1403,8 +1403,12 @@ func (s *Site) assembleMenus() (navigation.Menus, error) {
 
 	// add menu entries from config to flat hash
 	for name, menu := range s.conf.Menus.Config {
-		for _, me := range menu {
-			if types.IsNil(me.Page) && me.PageRef != "" {
+		for _, x := range menu {
+			// Shallow copy the menu entry, so we can set the URL and page without modifying the config.
+			c := *x
+			me := &c
+
+			if me.PageRef != "" {
 				// Try to resolve the page.
 				me.Page, _ = s.getPage(nil, me.PageRef)
 			}
-- 
2.39.5