RCE in Ascensio System Sia Onlyoffice
CVE-2025-10255
A vulnerability was determined in Ascensio System SIA OnlyOffice up to 12.7.0. Impacted is an unknown function of the file /Products/Projects/Messages.aspx of the component Comment Handler. Executing manipulation can lead to cross site scr…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.003 (20.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
Affected products
- Ascensio System Sia Onlyoffice — versions 12.0, 12.1, 12.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cna@vuldb.com (vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (exploit)
Frequently asked questions
- What is CVE-2025-10255?
- CVE-2025-10255 is a low-severity vulnerability in Ascensio System Sia Onlyoffice, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2025-09-11.
- How severe is CVE-2025-10255?
- Low severity. CVSS v3 base score is 3.5 out of 10.
- Is CVE-2025-10255 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.