CVE-2023-34461 Cross-site Scripting (XSS) Availability in PyBB
Attackers with posting privileges can inject malicious HTML/JavaScript into PyBB posts, leading to client-side code execution.
- 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-2023-34461?
CVE-2023-34461 is a medium-severity cross-site scripting vulnerability in benjjvi PyBB, published on 19 Jun 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
PyBB is an open source bulletin board. A manual code review of the PyBB bulletin board server has revealed that a vulnerability could have been exploited in which users could submit any type of HTML tag, and have said tag run. For example, a malicious `<a>` that looks like ```<a href=javascript:alert (1)>xss</a>``` could have been used to run code through JavaScript on the client side. The problem has been patched as of commit `5defd92`, and users are advised to upgrade. Attackers do need posting privilege in order to exploit this vulnerability. This vulnerability is present within the 0.1.0 release, and users are advised to upgrade to 0.1.1. Users unable to upgrade may be able to work around the attack by either; Removing the ability to create posts, removing the `|safe` tag from the Jinja2 template titled "post.html" in templates or by adding manual validation of links in the post creation section.
Weakness: CWE-79
Which versions are affected by CVE-2023-34461?
It affects 1 product.
Products include Pybb Project Pybb.
How do I fix CVE-2023-34461?
No fix has been published for CVE-2023-34461 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-2023-34461 being exploited?
There is no known exploitation of CVE-2023-34461 in the wild and no public exploit code.