diff --git a/src/core/plugins/spec/selectors.js b/src/core/plugins/spec/selectors.js
index 82607ac8f1f..8dd36dc3ce2 100644
--- a/src/core/plugins/spec/selectors.js
+++ b/src/core/plugins/spec/selectors.js
@@ -494,12 +494,21 @@ export const validationErrors = (state, pathMethod) => {
   let paramValues = state.getIn(["meta", "paths", ...pathMethod, "parameters"], fromJS([]))
   const result = []
 
+  const formatErrors = (errors) => {
+    const stringifyMap = (e) => {
+      return `${e.get("propKey") || e.get("index")}: ${
+        Map.isMap(e.get("error")) ? formatErrors(e.get("error")) : e.get("error")
+      }`
+    }
+    return List.isList(errors)
+      ? errors.map((e) => (Map.isMap(e) ? stringifyMap(e) : e))
+      : stringifyMap(errors)
+  }
+
   paramValues.forEach( (p) => {
     let errors = p.get("errors")
     if (errors && errors.count()) {
-      errors
-        .map((e) => (Map.isMap(e) ? `${e.get("propKey")}: ${e.get("error")}` : e))
-        .forEach((e) => result.push(e))
+      formatErrors(errors).forEach((e) => result.push(e))
     }
   })
   return result
diff --git a/test/unit/core/plugins/spec/selectors.js b/test/unit/core/plugins/spec/selectors.js
index 29f6ca25a34..d26a93efe5b 100644
--- a/test/unit/core/plugins/spec/selectors.js
+++ b/test/unit/core/plugins/spec/selectors.js
@@ -1411,6 +1411,52 @@ describe("validationErrors", function() {
               }
             }
           }
+        },
+        "/nested": {
+          post: {
+            parameters: {
+              arrayWithObjects: {
+                errors: [
+                  {
+                    error: "Parameter string value must be valid JSON", 
+                    index: 0
+                  },
+                  { 
+                    error: "Value must be a string", 
+                    index: 1
+                  }
+                ]
+              },
+              objectWithArray: {
+                errors: [
+                  {
+                    error: {
+                      error: {
+                        error: "Value must be a number",
+                        propKey: "b",
+                      },
+                      index: 0,
+                    },
+                    propKey: "a",
+                  }
+                ]
+              },
+              objectWithoutArray: {
+                errors: [
+                  {
+                    error: {
+                      error: {
+                        error: "Value must be a string",
+                        propKey: "e",
+                      },
+                      propKey: "d",
+                    },
+                    propKey: "c",
+                  }
+                ]
+              }
+            }
+          }
         }
       }
     }
@@ -1432,4 +1478,15 @@ describe("validationErrors", function() {
       "name: Value must be a string"
     ])
   })
+
+  it("should return formatted validation errors for nested parameters", function () {
+    const result = validationErrors(state, ["/nested", "post"])
+
+    expect(result).toEqual([
+      "0: Parameter string value must be valid JSON",
+      "1: Value must be a string",
+      "a: 0: b: Value must be a number",
+      "c: d: e: Value must be a string"
+    ])
+  })
 })