diff --git a/server/src/diagnostics/handlers/coreHandlers.ts b/server/src/diagnostics/handlers/coreHandlers.ts
index 502febb..ffcada0 100644
--- a/server/src/diagnostics/handlers/coreHandlers.ts
+++ b/server/src/diagnostics/handlers/coreHandlers.ts
@@ -9,9 +9,11 @@ import RelateTagHandler from './relateHandler';
 import ShorthandModifierHandler from './shorthandModifierHandler';
 import StatamicVersionHandler from './statamicVersionHandler';
 import TagsThatErrorHandler from './tagsThatErrorHandler';
+import UrlInputHandler from './urlInputHandler';
 
 const CoreHandlers: IDiagnosticsHandler[] = [
     DataDumpHandler,
+    UrlInputHandler,
     MixedModifierHandler,
     ModifierRuntimeTypeHandler,
     DoubleColonHandler,
diff --git a/server/src/diagnostics/handlers/urlInputHandler.ts b/server/src/diagnostics/handlers/urlInputHandler.ts
new file mode 100644
index 0000000..5110899
--- /dev/null
+++ b/server/src/diagnostics/handlers/urlInputHandler.ts
@@ -0,0 +1,58 @@
+import { AntlersError, ErrrorLevel } from '../../runtime/errors/antlersError';
+import { AntlersErrorCodes } from '../../runtime/errors/antlersErrorCodes';
+import { AntlersNode } from '../../runtime/nodes/abstractNode';
+import { intersect } from '../../runtime/utilities/arrayHelpers';
+import { IDiagnosticsHandler } from '../diagnosticsHandler';
+import ModifierManager from '../../antlers/modifierManager';
+
+const UrlInputHandler: IDiagnosticsHandler = {
+    checkNode(node: AntlersNode) {
+        const tagName = node.getTagName().toLowerCase(),
+            errors: AntlersError[] = [];
+        if (tagName == 'get' || tagName == 'post') {
+            const overlap = intersect(ModifierManager.instance?.getModifierNames() ?? [], node.modifiers.modifierNames);
+
+            // Return early if the developer is using custom modifiers. These may sanitize.
+            if (overlap.length == 0 && node.modifiers.modifierNames.length > 0 &&
+                (node.modifiers.modifierNames.length == 1 && ModifierManager?.instance?.hasMacro(node.modifiers.modifierNames[0])) == false) {
+                return errors;
+            }
+
+            let foundSanitizeInMacro = false;
+
+            for (let i = 0; i < node.modifiers.modifierNames.length; i++) {
+                const name = node.modifiers.modifierNames[i];
+
+                if (ModifierManager.instance?.hasMacro(name)) {
+                    const macro = ModifierManager.instance?.getMacro(name);
+
+                    if (macro != null) {
+                        for (let j = 0; j < macro.modifiers.length; j++) {
+                            const macroModifier = macro.modifiers[j];
+
+                            if (macroModifier.name == 'sanitize') {
+                                foundSanitizeInMacro = true;
+                                break;
+                            }
+                        }
+                    }
+                }
+            }
+
+            if (foundSanitizeInMacro == true) { return errors; }
+
+            if (node.modifiers.modifierNames.includes('sanitize') == false) {
+                errors.push(AntlersError.makeSyntaxError(
+                    AntlersErrorCodes.LINT_URL_VARIABLE_WITHOUT_SANITIZE,
+                    node,
+                    'Request variables can be controlled by the end user, and should be sanitized',
+                    ErrrorLevel.Warning
+                ));
+            }
+        }
+
+        return errors;
+    }
+}
+
+export default UrlInputHandler;
diff --git a/server/src/runtime/errors/antlersErrorCodes.ts b/server/src/runtime/errors/antlersErrorCodes.ts
index eb50980..8879d98 100644
--- a/server/src/runtime/errors/antlersErrorCodes.ts
+++ b/server/src/runtime/errors/antlersErrorCodes.ts
@@ -157,4 +157,5 @@ export class AntlersErrorCodes {
     static readonly LINT_INTERLEAVED_TAG_PAIRS = 'ANTLR_516';
     static readonly LINT_MISSING_REQUIRED_PARAMETER = 'ANTLR_517';
     static readonly LINT_POSSIBLE_PARTIAL_RECURSION = 'ANTLR_518';
+    static readonly LINT_URL_VARIABLE_WITHOUT_SANITIZE = 'ANTLR_519';
 }
\ No newline at end of file
diff --git a/server/src/runtime/parser/languageParser.ts b/server/src/runtime/parser/languageParser.ts
index aeb6e36..c4ffe13 100644
--- a/server/src/runtime/parser/languageParser.ts
+++ b/server/src/runtime/parser/languageParser.ts
@@ -15,6 +15,7 @@ export class LanguageParser {
     private pathParser: PathParser = new PathParser();
     protected tokens: AbstractNode[] = [];
 
+    private createdVariables: VariableNode[] = [];
     private createdModifierChains: ModifierChainNode[] = [];
     private createdLanguageOperators: LanguageOperatorConstruct[] = [];
     private createdArrays: ArrayNode[] = [];
@@ -62,6 +63,10 @@ export class LanguageParser {
         return this.createdArrays;
     }
 
+    public getCreatedVariables(): VariableNode[] {
+        return this.createdVariables;
+    }
+
     public getRuntimeAssignments(): StaticTracedAssignment[] {
         return this.tracedAssignments;
     }
@@ -347,6 +352,7 @@ export class LanguageParser {
         variableNode.refId = node.refId;
         variableNode.modifierChain = node.modifierChain;
         variableNode.index = node.index;
+        this.createdVariables.push(variableNode);
 
         return variableNode;
     }
@@ -418,6 +424,7 @@ export class LanguageParser {
                     NodeHelpers.mergeVarRight(left, right);
 
                     newNodes.push(right);
+                    this.createdVariables.push(right);
 
                     this.mergedVariablePaths.push(right);
                     this.mergedComponents.set(node, right);
@@ -444,7 +451,7 @@ export class LanguageParser {
 
                     NodeHelpers.mergeVarContentLeft(node.sourceTerminator + node.value + node.sourceTerminator, node, left);
                     NodeHelpers.mergeVarContentLeft(right.name, right, left);
-
+                    this.createdVariables.push(left);
                     newNodes.push(left);
                     this.mergedVariablePaths.push(left);
                     this.mergedComponents.set(node, left);
@@ -511,6 +518,7 @@ export class LanguageParser {
         varNodeWrap.content = operator.content;
         varNodeWrap.name = operator.content;
         varNodeWrap.originalAbstractNode = operator;
+        this.createdVariables.push(varNodeWrap);
 
         return varNodeWrap;
     }
@@ -2218,6 +2226,8 @@ export class LanguageParser {
                 varNode.endPosition = node.endPosition;
                 varNode.modifierChain = node.modifierChain;
                 varNode.originalAbstractNode = node;
+                this.createdVariables.push(varNode);
+
                 newNodes.push(varNode);
             } else {
                 newNodes.push(node);