CVE-2025-8550 atjiu pybbs list cross site scripting

Medium 4.8 Published 5 Aug 2025 Updated 5 Aug 2025

Remote attackers can inject malicious scripts via the Username argument in the admin topic list, potentially leading to code execution or account takeover.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-8550?

CVE-2025-8550 is a medium-severity cross-site scripting vulnerability in atjiu pybbs, published on 5 Aug 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official description

A vulnerability was found in atjiu pybbs up to 6.0.0. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /admin/topic/list. The manipulation of the argument Username leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The patch is named 2fe4a51afbce0068c291bc1818bbc8f7f3b01a22. It is recommended to apply a patch to fix this issue.

Weakness: CWE-94, CWE-79

Which versions are affected by CVE-2025-8550?

It affects 1 product.

Products include Pybbs Project Pybbs.

How do I fix CVE-2025-8550?

No fix has been published for CVE-2025-8550 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-2025-8550 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8550 exists.

Public exploit code: 1 Exploit-DB entry and 1 proofs of concept on GitHub.

Sources

Also known as GHSA-f3jv-7c92-wxgw.