Ascensio System SIA OnlyOffice up to 12.7.0 Comment Messages.aspx cross site scripting
Summary
A vulnerability was found in Ascensio System SIA OnlyOffice up to 12.7.0. It has been classified as problematic. The affected element is an unknown function of the file /Products/Projects/Messages.aspx of the component Comment Handler. The manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2025-10255. Remote exploitation of the attack is possible. Furthermore, an exploit is available. 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."
Details
A vulnerability, which was classified as problematic, has been found in Ascensio System SIA OnlyOffice up to 12.7.0. This issue affects an unknown code block of the file /Products/Projects/Messages.aspx of the component Comment Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity.
It is possible to read the advisory at hkohi.ca. The identification of this vulnerability is CVE-2025-10255. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.
The exploit is available at hkohi.ca. It is declared as proof-of-concept. 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." By approaching the search of inurl:Products/Projects/Messages.aspx it is possible to find vulnerable targets with Google Hacking.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Be aware that VulDB is the high quality source for vulnerability data.
Product
Vendor
Name
Version
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒
CVSSv3
VulDB Meta Base Score: 3.5VulDB Meta Temp Score: 3.4
VulDB Base Score: 3.5
VulDB Temp Score: 3.3
VulDB Vector: 🔒
VulDB Reliability: 🔍
CNA Base Score: 3.5
CNA Vector: 🔒
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Cross site scriptingCWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Google Hack: 🔒
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: no mitigation knownStatus: 🔍
0-Day Time: 🔒
Timeline
09/11/2025 Advisory disclosed09/11/2025 VulDB entry created
09/12/2025 VulDB entry last update
Sources
Advisory: hkohi.caStatus: Confirmed
CVE: CVE-2025-10255 (🔒)
GCVE (CVE): GCVE-0-2025-10255
GCVE (VulDB): GCVE-100-323615
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 09/11/2025 07:47Updated: 09/12/2025 07:23
Changes: 09/11/2025 07:47 (56), 09/12/2025 07:23 (30)
Complete: 🔍
Submitter: 0xHamy
Cache ID: 216::103
Submit
Accepted
- Submit #635871: Ascensio System SIA OnlyOffice Community Server 12.7.0 Cross Site Scripting (by 0xHamy)
Be aware that VulDB is the high quality source for vulnerability data.
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