CVE-2025-5301Public exploitNetwork attack vector

Script execution via unsanitized WOPI query parameters

Published Jun 12, 2025 · Updated Jun 18, 2025

Reflected XSS in ONLYOFFICE Docs 8.3.1 and earlier allows remote attackers to execute scripts in a user's browser via WOPI requests. The wopiClient.getEditorHtml handler passes raw req.query values into editor-wopi.ejs, where JSON.stringify output is embedded in a script block without safe escaping. Exploitation requires a victim's browser to submit an unauthenticated crafted POST, enabling session hijacking, phishing, or interface manipulation.

CVSS severity6.1
Medium
EPSS probability62.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in ONLYOFFICE Docs 8.3.1 and earlier allows remote attackers to execute scripts in a user's browser via WOPI requests. The wopiClient.getEditorHtml handler passes raw req.query values into editor-wopi.ejs, where JSON.stringify output is embedded in a script block without safe escaping. Exploitation requires a victim's browser to submit an unauthenticated crafted POST, enabling session hijacking, phishing, or interface manipulation.

The record

CVE
CVE-2025-5301
Published
Jun 12, 2025
Updated
Jun 18, 2025
Vendor
ONLYOFFICE
Product
ONLYOFFICE Docs
Classifications
CWE-79, CAPEC-591, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<=8.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ONLYOFFICE · ONLYOFFICE Docsversion=<=8.3.1

Published CVSS scores

6.1CISACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-591Reflected XSS
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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