diff --git a/common/src/main/java/org/keycloak/common/util/PathMatcher.java b/common/src/main/java/org/keycloak/common/util/PathMatcher.java
index 302c2553cc..d7c609f7f4 100644
--- a/common/src/main/java/org/keycloak/common/util/PathMatcher.java
+++ b/common/src/main/java/org/keycloak/common/util/PathMatcher.java
@@ -202,7 +202,9 @@ public abstract class PathMatcher<P> {
                         }
                     }
 
-                    i = expectedUri.indexOf('}', i);
+                    if (c == '{') {
+                        i = expectedUri.indexOf('}', i);
+                    }
 
                     if (i == expectedUri.lastIndexOf('}') && onlyFirstParam) {
                         return String.valueOf(matchingUri).substring(0, matchingUriLastIndex);
diff --git a/common/src/test/java/org/keycloak/common/util/PathMatcherTest.java b/common/src/test/java/org/keycloak/common/util/PathMatcherTest.java
new file mode 100644
index 0000000000..2af7c68ffe
--- /dev/null
+++ b/common/src/test/java/org/keycloak/common/util/PathMatcherTest.java
@@ -0,0 +1,34 @@
+package org.keycloak.common.util;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Collection;
+
+public class PathMatcherTest {
+
+    @Test
+    public void keycloak15833Test() {
+        TestingPathMatcher matcher = new TestingPathMatcher();
+
+        Assert.assertNull(matcher.customBuildUriFromTemplate("/api/v1/{clientId}/campaigns/*/excelFiles", "/api/v1/1/contentConnectorConfigs/29/contentConnectorContents", false));
+    }
+    
+    private static final class TestingPathMatcher extends PathMatcher<Object> {
+
+        @Override
+        protected String getPath(Object entry) {
+            return null;
+        }
+
+        @Override
+        protected Collection<Object> getPaths() {
+            return null;
+        }
+
+        // Make buildUriFromTemplate accessible from test
+        public String customBuildUriFromTemplate(String template, String targetUri, boolean onlyFirstParam) {
+            return buildUriFromTemplate(template, targetUri, onlyFirstParam);
+        }
+    }
+}