| Description: | Jinja is an extensible templating engine. The `xmlattr` filter in
affected versions of Jinja accepts keys containing non-attribute
characters. XML/HTML attributes cannot contain spaces, `/`, `>`, or
`=`, as each would then be interpreted as starting a separate
attribute. If an application accepts keys (as opposed to only values)
as user input, and renders these in pages that other users see as
well, an attacker could use this to inject other attributes and
perform XSS. The fix for CVE-2024-22195 only addressed spaces but not
other characters. Accepting keys as user input is now explicitly
considered an unintended use case of the `xmlattr` filter, and code
that does so without otherwise validating the input should be flagged
as insecure, regardless of Jinja version. Accepting _values_ as user
input continues to be safe. This vulnerability is fixed in 3.1.4.
|
