diff --git a/.changeset/wet-bottles-tie.md b/.changeset/wet-bottles-tie.md
new file mode 100644
index 00000000000..2b86ee3a5fc
--- /dev/null
+++ b/.changeset/wet-bottles-tie.md
@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Account`: Add `signature` argument to the internal `_validateUserOp` function for custom signature handling logic.
diff --git a/contracts/account/Account.sol b/contracts/account/Account.sol
index 0767d5b7c9b..3c882596ca0 100644
--- a/contracts/account/Account.sol
+++ b/contracts/account/Account.sol
@@ -75,7 +75,7 @@ abstract contract Account is AbstractSigner, IAccount {
         bytes32 userOpHash,
         uint256 missingAccountFunds
     ) public virtual onlyEntryPoint returns (uint256) {
-        uint256 validationData = _validateUserOp(userOp, userOpHash);
+        uint256 validationData = _validateUserOp(userOp, userOpHash, userOp.signature);
         _payPrefund(missingAccountFunds);
         return validationData;
     }
@@ -84,15 +84,21 @@ abstract contract Account is AbstractSigner, IAccount {
      * @dev Returns the validationData for a given user operation. By default, this checks the signature of the
      * signable hash (produced by {_signableUserOpHash}) using the abstract signer ({AbstractSigner-_rawSignatureValidation}).
      *
+     * The `signature` parameter is taken directly from the user operation's `signature` field.
+     * This design enables derived contracts to implement custom signature handling logic,
+     * such as embedding additional data within the signature and processing it by overriding this function
+     * and optionally invoking `super`.
+     *
      * NOTE: The userOpHash is assumed to be correct. Calling this function with a userOpHash that does not match the
      * userOp will result in undefined behavior.
      */
     function _validateUserOp(
         PackedUserOperation calldata userOp,
-        bytes32 userOpHash
+        bytes32 userOpHash,
+        bytes calldata signature
     ) internal virtual returns (uint256) {
         return
-            _rawSignatureValidation(_signableUserOpHash(userOp, userOpHash), userOp.signature)
+            _rawSignatureValidation(_signableUserOpHash(userOp, userOpHash), signature)
                 ? ERC4337Utils.SIG_VALIDATION_SUCCESS
                 : ERC4337Utils.SIG_VALIDATION_FAILED;
     }
diff --git a/contracts/account/extensions/draft-AccountERC7579.sol b/contracts/account/extensions/draft-AccountERC7579.sol
index 41ebf2fed20..cd982167da1 100644
--- a/contracts/account/extensions/draft-AccountERC7579.sol
+++ b/contracts/account/extensions/draft-AccountERC7579.sol
@@ -207,13 +207,14 @@ abstract contract AccountERC7579 is Account, IERC1271, IERC7579Execution, IERC75
      */
     function _validateUserOp(
         PackedUserOperation calldata userOp,
-        bytes32 userOpHash
+        bytes32 userOpHash,
+        bytes calldata signature
     ) internal virtual override returns (uint256) {
         address module = _extractUserOpValidator(userOp);
         return
             isModuleInstalled(MODULE_TYPE_VALIDATOR, module, Calldata.emptyBytes())
                 ? IERC7579Validator(module).validateUserOp(userOp, _signableUserOpHash(userOp, userOpHash))
-                : super._validateUserOp(userOp, userOpHash);
+                : super._validateUserOp(userOp, userOpHash, signature);
     }
 
     /**
diff --git a/contracts/mocks/account/AccountMock.sol b/contracts/mocks/account/AccountMock.sol
index b9617ca7454..b5e17bf42c7 100644
--- a/contracts/mocks/account/AccountMock.sol
+++ b/contracts/mocks/account/AccountMock.sol
@@ -102,9 +102,10 @@ abstract contract AccountERC7702WithModulesMock is
 {
     function _validateUserOp(
         PackedUserOperation calldata userOp,
-        bytes32 userOpHash
+        bytes32 userOpHash,
+        bytes calldata signature
     ) internal virtual override(Account, AccountERC7579) returns (uint256) {
-        return super._validateUserOp(userOp, userOpHash);
+        return super._validateUserOp(userOp, userOpHash, signature);
     }
 
     /// @dev Resolve implementation of ERC-1271 by both ERC7739 and AccountERC7579 to support both schemes.