CVE-2023-50883

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-09-09 · updated 2026-06-17
Weakness: CWE-79

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.

Affected products

ONLYOFFICE Document Server: before 8.0.1 — fixed in 8.0.1

How to fix

Upgrade to a fixed version: ONLYOFFICE Document Server 8.0.1. Check the vendor advisory for mitigations.

References

https://www.onlyoffice.com/
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2023-027.txt
https://www.syss.de/pentest-blog/cross-site-scripting-schwachstelle-in-onlyoffice-docs-syss-2023-027

Get alerted when CVE-2023-50883 or the next vulnerability affects your stack