diff --git a/lib/init-action.js b/lib/init-action.js
index 0ea051433..6579713b3 100644
--- a/lib/init-action.js
+++ b/lib/init-action.js
@@ -88056,7 +88056,7 @@ function generateCodeScanningConfig(logger, originalUserInput, augmentationPrope
   }
   return augmentedConfig;
 }
-function parseUserConfig(pathInput, contents) {
+function parseUserConfig(logger, pathInput, contents) {
   try {
     const schema2 = (
       // eslint-disable-next-line @typescript-eslint/no-require-imports
@@ -88065,10 +88065,13 @@ function parseUserConfig(pathInput, contents) {
     const doc = load(contents);
     const result = new jsonschema.Validator().validate(doc, schema2);
     if (result.errors.length > 0) {
+      for (const error2 of result.errors) {
+        logger.error(error2.stack);
+      }
       throw new ConfigurationError(
         getInvalidConfigFileMessage(
           pathInput,
-          `The configuration file contained ${result.errors.length} error(s)`
+          `There are ${result.errors.length} error(s)`
         )
       );
     }
@@ -89284,7 +89287,7 @@ async function downloadCacheWithTime(trapCachingEnabled, codeQL, languages, logg
   }
   return { trapCaches, trapCacheDownloadTime };
 }
-async function loadUserConfig(configFile, workspacePath, apiDetails, tempDir) {
+async function loadUserConfig(logger, configFile, workspacePath, apiDetails, tempDir) {
   if (isLocal(configFile)) {
     if (configFile !== userConfigFromActionPath(tempDir)) {
       configFile = path11.resolve(workspacePath, configFile);
@@ -89294,9 +89297,9 @@ async function loadUserConfig(configFile, workspacePath, apiDetails, tempDir) {
         );
       }
     }
-    return getLocalConfig(configFile);
+    return getLocalConfig(logger, configFile);
   } else {
-    return await getRemoteConfig(configFile, apiDetails);
+    return await getRemoteConfig(logger, configFile, apiDetails);
   }
 }
 var OVERLAY_ANALYSIS_FEATURES = {
@@ -89443,6 +89446,7 @@ async function initConfig(inputs) {
   } else {
     logger.debug(`Using configuration file: ${inputs.configFile}`);
     userConfig = await loadUserConfig(
+      logger,
       inputs.configFile,
       inputs.workspacePath,
       inputs.apiDetails,
@@ -89508,15 +89512,19 @@ function isLocal(configPath) {
   }
   return configPath.indexOf("@") === -1;
 }
-function getLocalConfig(configFile) {
+function getLocalConfig(logger, configFile) {
   if (!fs9.existsSync(configFile)) {
     throw new ConfigurationError(
       getConfigFileDoesNotExistErrorMessage(configFile)
     );
   }
-  return parseUserConfig(configFile, fs9.readFileSync(configFile, "utf-8"));
+  return parseUserConfig(
+    logger,
+    configFile,
+    fs9.readFileSync(configFile, "utf-8")
+  );
 }
-async function getRemoteConfig(configFile, apiDetails) {
+async function getRemoteConfig(logger, configFile, apiDetails) {
   const format = new RegExp(
     "(?<owner>[^/]+)/(?<repo>[^/]+)/(?<path>[^@]+)@(?<ref>.*)"
   );
@@ -89545,6 +89553,7 @@ async function getRemoteConfig(configFile, apiDetails) {
     );
   }
   return parseUserConfig(
+    logger,
     configFile,
     Buffer.from(fileContents, "base64").toString("binary")
   );
diff --git a/src/config-utils.ts b/src/config-utils.ts
index 1c0346340..121eae324 100644
--- a/src/config-utils.ts
+++ b/src/config-utils.ts
@@ -526,6 +526,7 @@ async function downloadCacheWithTime(
 }
 
 async function loadUserConfig(
+  logger: Logger,
   configFile: string,
   workspacePath: string,
   apiDetails: api.GitHubApiCombinedDetails,
@@ -542,9 +543,9 @@ async function loadUserConfig(
         );
       }
     }
-    return getLocalConfig(configFile);
+    return getLocalConfig(logger, configFile);
   } else {
-    return await getRemoteConfig(configFile, apiDetails);
+    return await getRemoteConfig(logger, configFile, apiDetails);
   }
 }
 
@@ -801,6 +802,7 @@ export async function initConfig(inputs: InitConfigInputs): Promise<Config> {
   } else {
     logger.debug(`Using configuration file: ${inputs.configFile}`);
     userConfig = await loadUserConfig(
+      logger,
       inputs.configFile,
       inputs.workspacePath,
       inputs.apiDetails,
@@ -898,7 +900,7 @@ function isLocal(configPath: string): boolean {
   return configPath.indexOf("@") === -1;
 }
 
-function getLocalConfig(configFile: string): UserConfig {
+function getLocalConfig(logger: Logger, configFile: string): UserConfig {
   // Error if the file does not exist
   if (!fs.existsSync(configFile)) {
     throw new ConfigurationError(
@@ -906,10 +908,15 @@ function getLocalConfig(configFile: string): UserConfig {
     );
   }
 
-  return parseUserConfig(configFile, fs.readFileSync(configFile, "utf-8"));
+  return parseUserConfig(
+    logger,
+    configFile,
+    fs.readFileSync(configFile, "utf-8"),
+  );
 }
 
 async function getRemoteConfig(
+  logger: Logger,
   configFile: string,
   apiDetails: api.GitHubApiCombinedDetails,
 ): Promise<UserConfig> {
@@ -948,6 +955,7 @@ async function getRemoteConfig(
   }
 
   return parseUserConfig(
+    logger,
     configFile,
     Buffer.from(fileContents, "base64").toString("binary"),
   );
diff --git a/src/config/db-config.test.ts b/src/config/db-config.test.ts
index 1308dbb4e..f6f73b311 100644
--- a/src/config/db-config.test.ts
+++ b/src/config/db-config.test.ts
@@ -2,6 +2,12 @@ import test, { ExecutionContext } from "ava";
 
 import { RepositoryProperties } from "../feature-flags/properties";
 import { KnownLanguage, Language } from "../languages";
+import { getRunnerLogger } from "../logging";
+import {
+  checkExpectedLogMessages,
+  getRecordingLogger,
+  LoggedMessage,
+} from "../testing-utils";
 import { ConfigurationError, prettyPrintPack } from "../util";
 
 import * as dbConfig from "./db-config";
@@ -394,6 +400,7 @@ test(
 
 test("parseUserConfig - successfully parses valid YAML", (t) => {
   const result = dbConfig.parseUserConfig(
+    getRunnerLogger(true),
     "test",
     `
     paths-ignore:
@@ -418,6 +425,7 @@ test("parseUserConfig - throws a ConfigurationError if the file is not valid YAM
   t.throws(
     () =>
       dbConfig.parseUserConfig(
+        getRunnerLogger(true),
         "test",
         `
         paths-ignore:
@@ -431,3 +439,27 @@ test("parseUserConfig - throws a ConfigurationError if the file is not valid YAM
     },
   );
 });
+
+test("parseUserConfig - throws a ConfigurationError if validation fails", (t) => {
+  const loggedMessages: LoggedMessage[] = [];
+  const logger = getRecordingLogger(loggedMessages);
+
+  t.throws(
+    () =>
+      dbConfig.parseUserConfig(
+        logger,
+        "test",
+        `
+        paths-ignore:
+         - "some/path"
+        queries: true
+        `,
+      ),
+    {
+      instanceOf: ConfigurationError,
+    },
+  );
+
+  const expectedMessages = ["instance.queries is not of a type(s) array"];
+  checkExpectedLogMessages(t, loggedMessages, expectedMessages);
+});
diff --git a/src/config/db-config.ts b/src/config/db-config.ts
index 3d7a8f471..b20c4fbee 100644
--- a/src/config/db-config.ts
+++ b/src/config/db-config.ts
@@ -480,12 +480,14 @@ export function generateCodeScanningConfig(
 /**
  * Attempts to parse `contents` into a `UserConfig` value.
  *
+ * @param logger The logger to use.
  * @param pathInput The path to the file where `contents` was obtained from, for use in error messages.
  * @param contents The string contents of a YAML file to try and parse as a `UserConfig`.
  * @returns The `UserConfig` corresponding to `contents`, if parsing was successful.
  * @throws A `ConfigurationError` if parsing failed.
  */
 export function parseUserConfig(
+  logger: Logger,
   pathInput: string,
   contents: string,
 ): UserConfig {
@@ -498,10 +500,13 @@ export function parseUserConfig(
     const result = new jsonschema.Validator().validate(doc, schema);
 
     if (result.errors.length > 0) {
+      for (const error of result.errors) {
+        logger.error(error.stack);
+      }
       throw new ConfigurationError(
         errorMessages.getInvalidConfigFileMessage(
           pathInput,
-          `The configuration file contained ${result.errors.length} error(s)`,
+          `There are ${result.errors.length} error(s)`,
         ),
       );
     }