CVE-2021-24807 Support Board < 3.3.5 - Agent+ Stored Cross-Site Scripting
Authenticated agents can inject malicious scripts via the notes field, leading to XSS execution for administrators and other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-24807?
CVE-2021-24807 is a medium-severity cross-site scripting vulnerability in Unknown Support Board, published on 8 Nov 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
The Support Board WordPress plugin before 3.3.5 allows Authenticated (Agent+) users to perform Cross-Site Scripting attacks by placing a payload in the notes field, when an administrator or any authenticated user go to the chat the XSS will be automatically executed.
Weakness: CWE-79
Which versions are affected by CVE-2021-24807?
It affects 1 product.
Products include Schiocco Support Board.
How do I fix CVE-2021-24807?
No fix has been published for CVE-2021-24807 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-24807 being exploited?
There is no known exploitation of CVE-2021-24807 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Unknown Support Board
- CVE-2025-4828 Support Board <= 3.8.0 - Unauthenticated Arbitrary File Deletion
- CVE-2025-4855 Support Board <= 3.8.0 - Unauthenticated Authorization Bypass due to Use of Default Secret Key
- CVE-2026-4815 SQL Injection vulnerability in Support Board
- CVE-2021-24823 Support Board < 3.3.6 - Arbitrary File Deletion via CSRF
- CVE-2026-4816 Reflected Cross Site Scripting (XSS) vulnerability in Support Board
Sources
Also known as GHSA-g623-mj4w-fprv.