diff --git a/apps/api/src/app/account/get-all-accounts.dto.ts b/apps/api/src/app/account/get-all-accounts.dto.ts
index 61a2480195..af10840d58 100644
--- a/apps/api/src/app/account/get-all-accounts.dto.ts
+++ b/apps/api/src/app/account/get-all-accounts.dto.ts
@@ -1,9 +1,10 @@
 import { FilterDto } from '@ghostfolio/api/dtos/filter.dto';
 
-import { IsOptional, IsString } from 'class-validator';
+import { IsOptional, IsString, MaxLength } from 'class-validator';
 
 export class GetAllAccountsDto extends FilterDto {
   @IsOptional()
   @IsString()
+  @MaxLength(255)
   query?: string;
 }
diff --git a/apps/api/src/app/portfolio/get-holdings.dto.ts b/apps/api/src/app/portfolio/get-holdings.dto.ts
index b776bfe0d9..61413f299b 100644
--- a/apps/api/src/app/portfolio/get-holdings.dto.ts
+++ b/apps/api/src/app/portfolio/get-holdings.dto.ts
@@ -1,7 +1,7 @@
 import { DateRangeFilterDto } from '@ghostfolio/api/dtos/date-range-filter.dto';
 import { HoldingType } from '@ghostfolio/common/types';
 
-import { IsIn, IsOptional, IsString } from 'class-validator';
+import { IsIn, IsOptional, IsString, MaxLength } from 'class-validator';
 
 export class GetHoldingsDto extends DateRangeFilterDto {
   @IsIn(['ACTIVE', 'CLOSED'] as HoldingType[])
@@ -10,5 +10,6 @@ export class GetHoldingsDto extends DateRangeFilterDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(255)
   query?: string;
 }
diff --git a/apps/api/src/dtos/filter.dto.ts b/apps/api/src/dtos/filter.dto.ts
index cb26d582bc..20cfa518db 100644
--- a/apps/api/src/dtos/filter.dto.ts
+++ b/apps/api/src/dtos/filter.dto.ts
@@ -1,4 +1,4 @@
-import { IsOptional, IsString } from 'class-validator';
+import { IsOptional, IsString, MaxLength } from 'class-validator';
 
 export class FilterDto {
   @IsOptional()
@@ -15,6 +15,7 @@ export class FilterDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(255)
   symbol?: string;
 
   @IsOptional()
diff --git a/libs/common/src/lib/dtos/create-account.dto.ts b/libs/common/src/lib/dtos/create-account.dto.ts
index ccadff5f97..db7d82119a 100644
--- a/libs/common/src/lib/dtos/create-account.dto.ts
+++ b/libs/common/src/lib/dtos/create-account.dto.ts
@@ -7,6 +7,7 @@ import {
   IsNumber,
   IsOptional,
   IsString,
+  MaxLength,
   ValidateIf
 } from 'class-validator';
 import { isString } from 'lodash';
@@ -22,6 +23,7 @@ export class CreateAccountDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(2000)
   @Transform(({ value }: TransformFnParams) =>
     isString(value) ? value.trim() : value
   )
diff --git a/libs/common/src/lib/dtos/create-asset-profile.dto.ts b/libs/common/src/lib/dtos/create-asset-profile.dto.ts
index 17a9d12b9d..1579a3debb 100644
--- a/libs/common/src/lib/dtos/create-asset-profile.dto.ts
+++ b/libs/common/src/lib/dtos/create-asset-profile.dto.ts
@@ -9,6 +9,7 @@ import {
   IsOptional,
   IsString,
   IsUrl,
+  MaxLength,
   ValidateNested
 } from 'class-validator';
 
@@ -27,6 +28,7 @@ export class CreateAssetProfileDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(2000)
   comment?: string;
 
   @IsArray()
diff --git a/libs/common/src/lib/dtos/create-order.dto.ts b/libs/common/src/lib/dtos/create-order.dto.ts
index c70b66b025..5e3fc8c9f2 100644
--- a/libs/common/src/lib/dtos/create-order.dto.ts
+++ b/libs/common/src/lib/dtos/create-order.dto.ts
@@ -12,6 +12,7 @@ import {
   IsNumber,
   IsOptional,
   IsString,
+  MaxLength,
   Min,
   Validate
 } from 'class-validator';
@@ -32,6 +33,7 @@ export class CreateOrderDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(2000)
   @Transform(({ value }: TransformFnParams) =>
     isString(value) ? value.trim() : value
   )
@@ -61,6 +63,7 @@ export class CreateOrderDto {
   quantity: number;
 
   @IsString()
+  @MaxLength(255)
   symbol: string;
 
   @ArrayUnique()
diff --git a/libs/common/src/lib/dtos/update-account.dto.ts b/libs/common/src/lib/dtos/update-account.dto.ts
index 4e1570aad6..3ad3745955 100644
--- a/libs/common/src/lib/dtos/update-account.dto.ts
+++ b/libs/common/src/lib/dtos/update-account.dto.ts
@@ -7,6 +7,7 @@ import {
   IsNumber,
   IsOptional,
   IsString,
+  MaxLength,
   ValidateIf
 } from 'class-validator';
 import { isString } from 'lodash';
@@ -22,6 +23,7 @@ export class UpdateAccountDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(2000)
   @Transform(({ value }: TransformFnParams) =>
     isString(value) ? value.trim() : value
   )
diff --git a/libs/common/src/lib/dtos/update-asset-profile.dto.ts b/libs/common/src/lib/dtos/update-asset-profile.dto.ts
index a8eaad608a..cd1461fcd5 100644
--- a/libs/common/src/lib/dtos/update-asset-profile.dto.ts
+++ b/libs/common/src/lib/dtos/update-asset-profile.dto.ts
@@ -16,6 +16,7 @@ import {
   IsOptional,
   IsString,
   IsUrl,
+  MaxLength,
   ValidateNested
 } from 'class-validator';
 
@@ -35,6 +36,7 @@ export class UpdateAssetProfileDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(2000)
   comment?: string | null;
 
   @IsArray()
diff --git a/libs/common/src/lib/dtos/update-order.dto.ts b/libs/common/src/lib/dtos/update-order.dto.ts
index d8fdbe66b6..b56cdcfbdc 100644
--- a/libs/common/src/lib/dtos/update-order.dto.ts
+++ b/libs/common/src/lib/dtos/update-order.dto.ts
@@ -11,6 +11,7 @@ import {
   IsNumber,
   IsOptional,
   IsString,
+  MaxLength,
   Min,
   Validate
 } from 'class-validator';
@@ -31,6 +32,7 @@ export class UpdateOrderDto {
 
   @IsOptional()
   @IsString()
+  @MaxLength(2000)
   @Transform(({ value }: TransformFnParams) =>
     isString(value) ? value.trim() : value
   )
@@ -62,6 +64,7 @@ export class UpdateOrderDto {
   quantity: number;
 
   @IsString()
+  @MaxLength(255)
   symbol: string;
 
   @ArrayUnique()