add ghsa links

CHANGES.rst

@@ -107,6 +107,7 @@ Released 2023-05-01
 
 -   Set ``Vary: Cookie`` header when the session is accessed, modified, or refreshed.
 -   Update Werkzeug requirement to >=2.3.3 to apply recent bug fixes.
+    :ghsa:`m2qf-hxjv-5gpq`
 
 
 Version 2.3.1

docs/conf.py

@@ -26,6 +26,7 @@ autodoc_preserve_defaults = True
 extlinks = {
     "issue": ("https://github.com/pallets/flask/issues/%s", "#%s"),
     "pr": ("https://github.com/pallets/flask/pull/%s", "#%s"),
+    "ghsa": ("https://github.com/pallets/flask/security/advisories/GHSA-%s", "GHSA-%s"),
 }
 intersphinx_mapping = {
     "python": ("https://docs.python.org/3/", None),