CVE-2023-50883 Cross-site scripting in n/a

Medium 6.1 Published 9 Sep 2024 Updated 10 Sep 2024

An XSS vulnerability in ONLYOFFICE Docs allows sandbox escape via Function constructor, enabling code execution.

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-2023-50883?

CVE-2023-50883 is a medium-severity cross-site scripting vulnerability in n/a, published on 9 Sep 2024. 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

ONLYOFFICE Docs before 8.0.1 allows XSS because a macro is an immediately-invoked function expression (IIFE), and therefore a sandbox escape is possible by directly calling the constructor of the Function object. NOTE: this issue exists because of an incorrect fix for CVE-2021-43446.

Weakness: CWE-79

Which versions are affected by CVE-2023-50883?

It affects 1 product.

Products include Onlyoffice Document Server.

How do I fix CVE-2023-50883?

No fix has been published for CVE-2023-50883 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-2023-50883 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-50883 exists.

Sources

Also known as GHSA-rcqr-8g6q-fmc3.