diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0e11e8..e07f106 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## v4.1.0
+- [Allow base/ref override on pull_request events](https://github.com/dorny/paths-filter/pull/NNN)
+
 ## v4.0.0
 - [Update action runtime to node24](https://github.com/dorny/paths-filter/pull/294)
 
diff --git a/README.md b/README.md
index a4b1035..359ef8a 100644
--- a/README.md
+++ b/README.md
@@ -117,7 +117,7 @@ For more information, see [CHANGELOG](https://github.com/dorny/paths-filter/blob
     # introduced by the current branch are considered.
     # All files are considered as added if there is no common ancestor with
     # base branch or no previous commit.
-    # This option is ignored if action is triggered by pull_request event.
+    # This option is ignored if action is triggered by pull_request event, unless 'allow-override-on-pr' is set to true.
     # Default: repository default branch (e.g. master)
     base: ''
 
@@ -126,7 +126,7 @@ For more information, see [CHANGELOG](https://github.com/dorny/paths-filter/blob
     # but you want to get changes on a different branch.
     # If this is empty and action is triggered by merge_group event,
     # the head commit in the event will be used.
-    # This option is ignored if action is triggered by pull_request event.
+    # This option is ignored if action is triggered by pull_request event, unless 'allow-override-on-pr' is set to true.
     # default: ${{ github.ref }}
     ref:
 
@@ -178,6 +178,14 @@ For more information, see [CHANGELOG](https://github.com/dorny/paths-filter/blob
     #  - '!**/*.jpeg'
     #  - '!**/*.md'
     predicate-quantifier: 'some'
+
+    # When true, the user-provided `base` and/or `ref` inputs are honored even if
+    # the action is triggered by a pull_request, pull_request_review,
+    # pull_request_review_comment, or pull_request_target event. In that case the
+    # action skips the GitHub API path and uses git diff against the provided
+    # base/ref. Has no effect if `base` and `ref` are both empty.
+    # Default: false
+    allow-override-on-pr: 'false'
 ```
 
 ## Outputs
diff --git a/action.yml b/action.yml
index 914524f..b6c14c5 100644
--- a/action.yml
+++ b/action.yml
@@ -49,6 +49,14 @@ inputs:
       allows to override the "at least one pattern" behavior to make it so that all of the patterns have to match or otherwise the file is excluded.
     required: false
     default: 'some'
+  allow-override-on-pr:
+    description: |
+      When true, the user-provided `base` and/or `ref` inputs are honored even if the action
+      is triggered by a pull_request, pull_request_review, pull_request_review_comment, or
+      pull_request_target event. In that case the action skips the GitHub API path and uses
+      git diff against the provided base/ref. Has no effect if `base` and `ref` are both empty.
+    required: false
+    default: 'false'
 outputs:
   changes:
     description: JSON array with names of all filters matching any of changed files
diff --git a/dist/index.js b/dist/index.js
index 3365cd3..3c92ab6 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -575,6 +575,7 @@ async function run() {
         const listFiles = core.getInput('list-files', { required: false }).toLowerCase() || 'none';
         const initialFetchDepth = parseInt(core.getInput('initial-fetch-depth', { required: false })) || 10;
         const predicateQuantifier = core.getInput('predicate-quantifier', { required: false }) || filter_1.PredicateQuantifier.SOME;
+        const allowOverrideOnPr = core.getBooleanInput('allow-override-on-pr', { required: false });
         if (!isExportFormat(listFiles)) {
             core.setFailed(`Input parameter 'list-files' is set to invalid value '${listFiles}'`);
             return;
@@ -586,7 +587,7 @@ async function run() {
         }
         const filterConfig = { predicateQuantifier };
         const filter = new filter_1.Filter(filtersYaml, filterConfig);
-        const files = await getChangedFiles(token, base, ref, initialFetchDepth);
+        const files = await getChangedFiles(token, base, ref, initialFetchDepth, allowOverrideOnPr);
         core.info(`Detected ${files.length} changed files`);
         const results = filter.match(files);
         exportResults(results, listFiles);
@@ -607,7 +608,7 @@ function getConfigFileContent(configPath) {
     }
     return fs.readFileSync(configPath, { encoding: 'utf8' });
 }
-async function getChangedFiles(token, base, ref, initialFetchDepth) {
+async function getChangedFiles(token, base, ref, initialFetchDepth, allowOverrideOnPr) {
     var _a, _b;
     // if base is 'HEAD' only local uncommitted changes will be detected
     // This is the simplest case as we don't need to fetch more commits or evaluate current/before refs
@@ -624,6 +625,10 @@ async function getChangedFiles(token, base, ref, initialFetchDepth) {
         case 'pull_request_review':
         case 'pull_request_review_comment':
         case 'pull_request_target': {
+            if (allowOverrideOnPr && (base || ref)) {
+                core.info(`'allow-override-on-pr' is enabled and base/ref were provided — skipping PR API and using git diff`);
+                return getChangedFilesFromGit(base, ref, initialFetchDepth);
+            }
             if (ref) {
                 core.warning(`'ref' input parameter is ignored when action is triggered by pull request event`);
             }
diff --git a/src/main.ts b/src/main.ts
index 8adb308..a522f0c 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -34,6 +34,7 @@ async function run(): Promise<void> {
     const listFiles = core.getInput('list-files', {required: false}).toLowerCase() || 'none'
     const initialFetchDepth = parseInt(core.getInput('initial-fetch-depth', {required: false})) || 10
     const predicateQuantifier = core.getInput('predicate-quantifier', {required: false}) || PredicateQuantifier.SOME
+    const allowOverrideOnPr = core.getBooleanInput('allow-override-on-pr', {required: false})
 
     if (!isExportFormat(listFiles)) {
       core.setFailed(`Input parameter 'list-files' is set to invalid value '${listFiles}'`)
@@ -49,7 +50,7 @@ async function run(): Promise<void> {
     const filterConfig: FilterConfig = {predicateQuantifier}
 
     const filter = new Filter(filtersYaml, filterConfig)
-    const files = await getChangedFiles(token, base, ref, initialFetchDepth)
+    const files = await getChangedFiles(token, base, ref, initialFetchDepth, allowOverrideOnPr)
     core.info(`Detected ${files.length} changed files`)
     const results = filter.match(files)
     exportResults(results, listFiles)
@@ -74,7 +75,13 @@ function getConfigFileContent(configPath: string): string {
   return fs.readFileSync(configPath, {encoding: 'utf8'})
 }
 
-async function getChangedFiles(token: string, base: string, ref: string, initialFetchDepth: number): Promise<File[]> {
+async function getChangedFiles(
+  token: string,
+  base: string,
+  ref: string,
+  initialFetchDepth: number,
+  allowOverrideOnPr: boolean
+): Promise<File[]> {
   // if base is 'HEAD' only local uncommitted changes will be detected
   // This is the simplest case as we don't need to fetch more commits or evaluate current/before refs
   if (base === git.HEAD) {
@@ -91,6 +98,10 @@ async function getChangedFiles(token: string, base: string, ref: string, initial
     case 'pull_request_review':
     case 'pull_request_review_comment':
     case 'pull_request_target': {
+      if (allowOverrideOnPr && (base || ref)) {
+        core.info(`'allow-override-on-pr' is enabled and base/ref were provided — skipping PR API and using git diff`)
+        return getChangedFilesFromGit(base, ref, initialFetchDepth)
+      }
       if (ref) {
         core.warning(`'ref' input parameter is ignored when action is triggered by pull request event`)
       }