Vulnerability · Published Sep 11, 2025 · Assigned by VulDB
CVE-2025-10255Ascensio System SIA OnlyOffice Comment Messages.aspx cross site scripting
Low 3.5
In plain English
A low-severity cross-site scripting in OnlyOffice from Ascensio System SIA. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Official description
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 scripting. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Ascensio System SIA | OnlyOffice | 12.012.112.212.312.412.512.612.7.0 |
Weakness: CWE-79, CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C
References
- VDB-323615 | Ascensio System SIA OnlyOffice Comment Messages.aspx cross site scripting vdb-entry
- VDB-323615 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
- Submit #635871 | Ascensio System SIA OnlyOffice Community Server 12.7.0 Cross Site Scripting third-party-advisory
- https://hkohi.ca/vulnerability/21 exploit