CVE-2025-5301
Reflected Cross-Site Scripting in ONLYOFFICE Docs (DocumentServer)
Exploitation likely. EPSS gives it a 62% chance of exploitation in the next 30 days. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
Steps
Written by AI from the record- 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.
What it is
From the CVE record
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
Written by AI from the recordONLYOFFICE 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.
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 you're affected
- Browser session theft
- Unauthorized user actions
- Document data exposure
- Workflow disruption
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
62% chance of exploitation activity in the next 30 days, which ranks it in the 99th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
10 events over 458 days, from the signal feeds we watch.
- EPSS band changemoderate → highepss band change
- OpenVAS check added
- EPSS band changelow → moderate
- Nuclei check added
- Patch availablerecord updated
- Publishedweakness classified, att&ck mapped
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Scored 6.1 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction RequiredA user must click a link, open a file, or perform some action
Scope
- Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)
Impact if exploited
- Confidentiality LowSome restricted information is disclosed, but limited in scope
- Integrity LowData modification is possible but limited in scope or consequence
- Availability NoneNo availability impact
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
- github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md
- r.sec-consult.com/onlyoffice
- seclists.org/fulldisclosure/2025/Jun/18
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