CVE-2025-5301

Reflected Cross-Site Scripting in ONLYOFFICE Docs (DocumentServer)

Published: Jun 12, 2025Updated: Jun 18, 2025 Sources: CVE List NVD BDUCWE-79

6.1MEDIUM

Description

ONLYOFFICE Docs (DocumentServer) in versions equal and below 8.3.1 are affected by a reflected cross-site scripting (XSS) issue when opening files via the WOPI protocol. Attackers could inject malicious scripts via crafted HTTP POST requests, which are then reflected in the server's HTML response.

In plain language

AI Low urgency

ONLYOFFICE Docs 8.3.1 and earlier can be tricked into running harmful code in a user’s browser when opening a prepared file through its web file-opening connection; most small businesses should schedule the available update.

Executive summary

Reflected XSS in ONLYOFFICE Docs (DocumentServer) via crafted HTTP POST requests when files are opened through WOPI, causing attacker-supplied script to be reflected in an HTML response.

If affected, business impact

Browser session theftUnauthorized user actionsDocument data exposureWorkflow disruption

What to do now

Check whether you run ONLYOFFICE Docs and use its WOPI web file-opening connection.
Upgrade ONLYOFFICE Docs to v8.3.2 or higher.
Until upgraded, limit access to the WOPI connection and warn users not to open unexpected shared files.

Some work to apply

What is it

A malicious file-opening request can make the service send a webpage containing an attacker’s instructions. It is like a forged note being placed inside an otherwise legitimate company form: when someone opens it, the note can try to act as that person in their browser.

Who is affected

This matters to you if you use or run ONLYOFFICE Docs to open files through its WOPI web file-opening connection. It is only a risk when that connection is enabled and an attacker can persuade someone to open a prepared file through it.

How urgent is it

No confirmed real-world exploitation is reported, and this issue requires an attacker to get someone to open a prepared file. This is a green, routine-update issue: apply the vendor update on your normal maintenance schedule, while giving priority to internet-accessible file-opening services.

What to do — in detail

Confirm the deployed ONLYOFFICE Docs version and identify whether WOPI file-opening endpoints are enabled or exposed to untrusted users. Upgrade to vendor-patched v8.3.2 or a later release, following the vendor’s release notes and testing the update against your document-storage and WOPI integrations before production rollout.

If patching is delayed, restrict WOPI access to trusted networks or authenticated users, remove unnecessary public exposure, and advise users not to open unexpected shared files. Review web-server and application logs for unusual POST requests to WOPI-related endpoints and unexpected HTML responses. CISA has not added this CVE to the Known Exploited Vulnerabilities catalog, so there is no CISA remediation due date.

Technical context

CVE-2025-5301 is CWE-79 reflected cross-site scripting with CVSS 6.1 (Medium): AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. Crafted HTTP POST input in the WOPI file-opening flow is reflected into an HTML response, allowing script execution in a victim’s browser after user interaction. CISA KEV does not list this CVE; available exploit evidence is limited to a detection template, not a weaponized exploit. EPSS predicts elevated likelihood (62.4%, 99th percentile) with a rising trend.

This is a general assessment based on public vulnerability data. It does not account for your specific infrastructure — when in doubt, consult a security specialist.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-79

Affected Products

Ascensio System SIA

commercial·LVaka onlyoffice docs, onlyoffice community server

ONLYOFFICE DocsMixed

Enterprise Software / collaboration-groupware

OnlyOffice

commercialaka onlyoffice document server

Docs (DocumentServer)Mixed

Enterprise Software / collaboration-groupware

Exploitability

Official Patch Available

Is your org exposed to CVE-2025-5301?Discuss checks for your systems with a specialist. Scope agreed before testing. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

View detailed technique mapping

References

https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md#832

github.com

https://r.sec-consult.com/onlyoffice

r.sec-consult.com

http://seclists.org/fulldisclosure/2025/Jun/18

seclists.org

and 1 more references View all →

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Plain-language analysis

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