CVE-2025-10255

Ascensio System SIA OnlyOffice Comment Messages.aspx cross site scripting

CVSS 5.1 MEDIUMEPSS 0.3%CWE-79 CWE-94

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.1EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

11 Sep 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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."

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Affected products

Ascensio System SIA · OnlyOffice

References

https://hkohi.ca/vulnerability/21 https://vuldb.com/?ctiid.323615 https://vuldb.com/?id.323615 https://vuldb.com/?submit.635871