CVE-2025-10254: Ascensio System Sia ONLYOFFICE

Low severity, CVSS 3.5. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability was found in Ascensio System SIA OnlyOffice up to 12.7.0. This issue affects some unknown processing of the file /Products/Projects/Messages.aspx of the component SVG Image Handler. Performing manipulation results in cross site scripting. The attack may be initiated remotely. The exploit has been made public and could be used. The vendor was informed early about this issue and replied: "We are already working on this case, and the issues will be resolved in one of the upcoming patches."

Affected products

• Ascensio System Sia ONLYOFFICE: version 12.0 only; version 12.1 only; version 12.2 only; version 12.3 only; version 12.4 only; version 12.5 only; …

Published 2025-09-11. Last modified 2026-06-17.