CVE-2023-34461 — MEDIUM (4.6)

Vulnerability 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.

CVSS Score

4.6

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Pybb Project	Pybb	0.1.0

Related Weaknesses (CWE)

CWE-79

References

https://github.com/benjjvi/PyBB/commit/5defd922ab05a193a783392d447c6538628cf854Patch
https://github.com/benjjvi/PyBB/security/advisories/GHSA-mv96-w49p-438pMitigationPatchThird Party Advisory
https://github.com/benjjvi/PyBB/commit/5defd922ab05a193a783392d447c6538628cf854Patch
https://github.com/benjjvi/PyBB/security/advisories/GHSA-mv96-w49p-438pMitigationPatchThird Party Advisory

FAQ

What is CVE-2023-34461?

CVE-2023-34461 is a vulnerability with a CVSS score of 4.6 (MEDIUM). 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 t...

How severe is CVE-2023-34461?

CVE-2023-34461 has been rated MEDIUM with a CVSS base score of 4.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2023-34461?

Check the references section above for vendor advisories and patch information. Affected products include: Pybb Project Pybb.