What’s Vulnerable › Vulnerabilities

CVE-2025-10255: Ascensio System SIA OnlyOffice Comment Messages.aspx cross site scripting

• Severity: low (CVSS 3.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-11 · updated 2026-06-17
• Weakness: CWE-79

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

• Ascensio System SIA OnlyOffice: 12.0, 12.1, 12.2, 12.3, 12.4, 12.5 (+2)

References

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

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