CVE-2023-1717 Bitrix24 Cross-Site Scripting (XSS) via Client-side Prototype Pollution

Critical 9.6 Published 1 Nov 2023 Updated 5 Sep 2024

Remote attackers can execute arbitrary JavaScript via prototype pollution, potentially leading to server-side code execution if the victim is an administrator.

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

What is CVE-2023-1717?

CVE-2023-1717 is a critical cross-site scripting vulnerability in Bitrix24, published on 1 Nov 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Prototype pollution in bitrix/templates/bitrix24/components/bitrix/menu/left_vertical/script.js in Bitrix24 22.0.300 allows remote attackers to execute arbitrary JavaScript code in the victim’s browser, and possibly execute arbitrary PHP code on the server if the victim has administrator privilege, via polluting `__proto__[tag]` and `__proto__[text]`.

Weakness: CWE-79, CWE-1321

Which versions are affected by CVE-2023-1717?

It affects 1 product.

Products include Bitrix24 Bitrix24.

How do I fix CVE-2023-1717?

No fix has been published for CVE-2023-1717 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-2023-1717 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-1717 exists.

Sources

Also known as GHSA-5vm6-5fwc-4g9h.