From 0807753295ef0ebcbde9c5a2faefff86f8902ec0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Paola=20Estefan=C3=ADa=20de=20Campos?=
 <84341268+Paola3stefania@users.noreply.github.com>
Date: Fri, 21 Nov 2025 13:49:05 -0300
Subject: [PATCH] fix(mongodb): mongodb findOneAndUpdate should return `.value`
 (#6139)

---
 .../src/adapters/mongodb-adapter/mongodb-adapter.ts         | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts b/packages/better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts
index eb8b65ac75..098ad3c53b 100644
--- a/packages/better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts
+++ b/packages/better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts
@@ -513,10 +513,12 @@ export const mongodbAdapter = (
 						{
 							session,
 							returnDocument: "after",
+							includeResultMetadata: true,
 						},
 					);
-					if (!res) return null;
-					return res as any;
+					const doc = (res as any)?.value ?? null;
+					if (!doc) return null;
+					return doc as any;
 				},
 				async updateMany({ model, where, update: values }) {
 					const clause = convertWhereClause({ where, model });