diff --git a/web/src/main/java/org/springframework/security/web/util/matcher/AntPathRequestMatcher.java b/web/src/main/java/org/springframework/security/web/util/matcher/AntPathRequestMatcher.java
index 3744824807..7d4c7f3c20 100644
--- a/web/src/main/java/org/springframework/security/web/util/matcher/AntPathRequestMatcher.java
+++ b/web/src/main/java/org/springframework/security/web/util/matcher/AntPathRequestMatcher.java
@@ -122,7 +122,7 @@ public final class AntPathRequestMatcher implements RequestMatcher {
      *    {@code servletPath} + {@code pathInfo} of the request.
      */
     public boolean matches(HttpServletRequest request) {
-        if (httpMethod != null && StringUtils.hasText(request.getMethod()) && httpMethod != HttpMethod.valueOf(request.getMethod())) {
+        if (httpMethod != null && StringUtils.hasText(request.getMethod()) && httpMethod != valueOf(request.getMethod())) {
             if (logger.isDebugEnabled()) {
                 logger.debug("Request '" + request.getMethod() + " " + getRequestPath(request) + "'"
                         + " doesn't match '" + httpMethod  + " " + pattern);
@@ -201,6 +201,21 @@ public final class AntPathRequestMatcher implements RequestMatcher {
         return sb.toString();
     }
 
+    /**
+     * Provides a save way of obtaining the HttpMethod from a String. If the method is invalid, returns null.
+     *
+     * @param method the HTTP method to use.
+     *
+     * @return the HttpMethod or null if method is invalid.
+     */
+    private static HttpMethod valueOf(String method) {
+        try {
+            return HttpMethod.valueOf(method);
+        } catch(IllegalArgumentException e) {}
+
+        return null;
+    }
+
     private static interface Matcher {
         boolean matches(String path);
     }
diff --git a/web/src/main/java/org/springframework/security/web/util/matcher/RegexRequestMatcher.java b/web/src/main/java/org/springframework/security/web/util/matcher/RegexRequestMatcher.java
index b355035d78..46a6b3acce 100644
--- a/web/src/main/java/org/springframework/security/web/util/matcher/RegexRequestMatcher.java
+++ b/web/src/main/java/org/springframework/security/web/util/matcher/RegexRequestMatcher.java
@@ -75,7 +75,7 @@ public final class RegexRequestMatcher implements RequestMatcher {
      * @return true if the pattern matches the URL, false otherwise.
      */
     public boolean matches(HttpServletRequest request) {
-        if (httpMethod != null && request.getMethod() != null && httpMethod != HttpMethod.valueOf(request.getMethod())) {
+        if (httpMethod != null && request.getMethod() != null && httpMethod != valueOf(request.getMethod())) {
             return false;
         }
 
@@ -102,4 +102,20 @@ public final class RegexRequestMatcher implements RequestMatcher {
 
         return pattern.matcher(url).matches();
     }
+
+
+    /**
+     * Provides a save way of obtaining the HttpMethod from a String. If the method is invalid, returns null.
+     *
+     * @param method the HTTP method to use.
+     *
+     * @return the HttpMethod or null if method is invalid.
+     */
+    private static HttpMethod valueOf(String method) {
+        try {
+            return HttpMethod.valueOf(method);
+        } catch(IllegalArgumentException e) {}
+
+        return null;
+    }
 }
diff --git a/web/src/test/java/org/springframework/security/web/util/matcher/AntPathRequestMatcherTests.java b/web/src/test/java/org/springframework/security/web/util/matcher/AntPathRequestMatcherTests.java
index 427e93d504..766768856e 100644
--- a/web/src/test/java/org/springframework/security/web/util/matcher/AntPathRequestMatcherTests.java
+++ b/web/src/test/java/org/springframework/security/web/util/matcher/AntPathRequestMatcherTests.java
@@ -151,6 +151,16 @@ public class AntPathRequestMatcherTests {
         new AntPathRequestMatcher("/blah", "GET").toString();
     }
 
+    // SEC-2831
+    @Test
+    public void matchesWithInvalidMethod() {
+        AntPathRequestMatcher matcher = new AntPathRequestMatcher("/blah", "GET");
+        MockHttpServletRequest request = createRequest("/blah");
+        request.setMethod("INVALID");
+
+        assertThat(matcher.matches(request)).isFalse();
+    }
+
     private HttpServletRequest createRequestWithNullMethod(String path) {
         when(request.getQueryString()).thenReturn("doesntMatter");
         when(request.getServletPath()).thenReturn(path);
diff --git a/web/src/test/java/org/springframework/security/web/util/matcher/RegexRequestMatcherTests.java b/web/src/test/java/org/springframework/security/web/util/matcher/RegexRequestMatcherTests.java
index a0f760ece8..a0a31936a8 100644
--- a/web/src/test/java/org/springframework/security/web/util/matcher/RegexRequestMatcherTests.java
+++ b/web/src/test/java/org/springframework/security/web/util/matcher/RegexRequestMatcherTests.java
@@ -12,6 +12,7 @@
  */
 package org.springframework.security.web.util.matcher;
 
+import static org.fest.assertions.Assertions.assertThat;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.when;
@@ -94,6 +95,16 @@ public class RegexRequestMatcherTests {
         assertFalse(matcher.matches(request));
     }
 
+    // SEC-2831
+    @Test
+    public void matchesWithInvalidMethod() {
+        RegexRequestMatcher matcher = new RegexRequestMatcher("/blah", "GET");
+        MockHttpServletRequest request = new MockHttpServletRequest("INVALID","/blah");
+        request.setMethod("INVALID");
+
+        assertThat(matcher.matches(request)).isFalse();
+    }
+
     private HttpServletRequest createRequestWithNullMethod(String path) {
         when(request.getQueryString()).thenReturn("doesntMatter");
         when(request.getServletPath()).thenReturn(path);