Name of the Vulnerable Software and Affected Versions:
Directus versions prior to 10.13.4
Directus versions prior to 11.2.0
Description:
The Comment feature in Directus has a filter to prevent users from adding restricted characters, such as HTML tags. However, this filter operates on the client-side, which can be bypassed, making the application vulnerable to HTML Injection. This issue can be exploited by directly sending a request to the endpoint, such as `PATCH /activity/comment/3 HTTP/2`, with a payload containing restricted characters, for example, `"comment": "<h1>TEST <p style="color:red">HTML INJECTION</p> <a href="//evil.com">Test Link</a></h1>"`. The introduction of session cookies makes this issue exploitable, allowing a malicious script to perform authenticated actions on the current user's behalf.
Recommendations:
For versions prior to 10.13.4, update to version 10.13.4 or later.
For versions prior to 11.2.0, update to version 11.2.0 or later.
As a temporary workaround, consider disabling the Comment feature until a patch is available.
Restrict access to the `/activity/comment` endpoint to minimize the risk of exploitation.
Avoid using the `comment` parameter in the affected API endpoint until the issue is resolved.