CVE-2023-34461
MediumCVSS 4.6Exploitation Probability (EPSS)
Low risk21th percentile - higher than 21% of all known CVEs
Summary
PyBB is an open source bulletin board software that contains a vulnerability allowing users to submit any type of HTML tag, which could lead to the execution of malicious JavaScript code on the client side. The issue has been patched in version 0.1.1, and users are advised to upgrade.
Risk Assessment
Attackers can exploit this vulnerability to inject malicious code, potentially leading to user data theft or session hijacking. Posting privileges are required to carry out the attack.
Recommendation
It is recommended to upgrade to version 0.1.1 to eliminate this vulnerability. Users unable to upgrade should consider removing the ability to create posts or adding manual validation of links.
Original NVD description (English source)
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.