backport #laravel/framework#35419

src/Illuminate/Validation/Validator.php

@@ -1204,7 +1204,7 @@ protected function validateActiveUrl($attribute, $value)
 	 */
 	protected function validateImage($attribute, $value)
 	{
-		return $this->validateMimes($attribute, $value, array('jpeg', 'png', 'gif', 'bmp'));
+		return $this->validateMimes($attribute, $value, array('jpg', 'jpeg', 'png', 'gif', 'bmp'));
 	}
 
 	/**

tests/Validation/ValidationValidatorTest.php

@@ -1010,6 +1010,12 @@ public function testValidateImage()
 		$file5->expects($this->any())->method('guessExtension')->willReturn('png');
 		$v->setFiles(['x' => $file5]);
 		$this->assertTrue($v->passes());
+
+        $file6 = $this->getMock(UploadedFile::class, ['guessExtension', 'getClientOriginalExtension'], $uploadedFile);
+        $file6->expects($this->any())->method('guessExtension')->willReturn('jpg');
+        $file6->expects($this->any())->method('getClientOriginalExtension')->willReturn('jpg');
+        $v->setFiles(['x' => $file6]);
+        $this->assertTrue($v->passes());
 	}