VulnerabilityPublished 25 Dec 2025

CVE-2025-68935: ONLYOFFICE Document Server · XSS or 'Cross-site Scripting'

Affects ONLYOFFICE Document ServerSource CVE Database V5

Not known to be exploited · CVSS 6.4 Medium · fixed in 9.2.1 : update ONLYOFFICE Document Server when convenient.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 3.1 base score

6.4Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 9.2.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
ONLYOFFICE Document Server	Affected =0	Fixed in–

AI-suggested

European organizations should implement the following specific mitigations: 1) Monitor ONLYOFFICE vendor communications closely and apply the security update to version 9.2.1 or later immediately upon release. 2) Until patched, restrict access to the Document Server interface to trusted users and networks, employing network segmentation and VPNs where possible. 3) Implement Web Application Firewall (WAF) rules to detect and block suspicious input patterns targeting the Font field or multilevel list settings. 4) Enforce Content Security Policy (CSP) headers to limit script execution sources and reduce XSS impact. 5) Conduct regular security audits and penetration tests focusing on input validation and output encoding in document management systems. 6) Educate users and administrators about the risks of XSS and encourage vigilance for unusual document behavior or interface anomalies. 7) Review and harden authentication and authorization controls to minimize the risk of low-privilege account compromise. 8) Log and monitor Document Server access and input fields for anomalous activity indicative of exploitation attempts.

Description

CVE-2025-68935 is a medium severity cross-site scripting (XSS) vulnerability in ONLYOFFICE Document Server versions before 9.2.1. The flaw arises from improper input neutralization in the Font field of the Multilevel list settings window, allowing an attacker with low privileges to inject malicious scripts without user interaction. Exploitation can lead to partial compromise of confidentiality and integrity, with no direct impact on availability. The vulnerability affects web-based document collaboration environments and could be leveraged for session hijacking or data theft. No known exploits are currently reported in the wild. Countries with higher adoption of ONLYOFFICE, such as Germany, France, and the UK, are more likely to be impacted. Given the CVSS score of 6.

Impact

For European organizations, the exploitation of this XSS vulnerability could lead to unauthorized disclosure of sensitive document data and potential manipulation of document content, undermining trust in collaborative workflows. Confidentiality impact is limited but significant in environments handling sensitive or regulated information, such as legal, financial, or governmental sectors. Integrity loss could result in altered documents without detection, affecting decision-making and compliance. Since the vulnerability requires low privileges but no user interaction, attackers who gain limited access to the Document Server interface could escalate their impact. The absence of availability impact reduces the risk of service disruption but does not diminish the threat to data security. Organizations relying on ONLYOFFICE Document Server for internal or external collaboration are at risk, especially if the server is internet-facing or accessible by multiple users. The medium severity rating suggests prioritization in patch management cycles, particularly in sectors with strict data protection regulations like GDPR.

Summary

CVE-2025-68935 is a cross-site scripting (XSS) vulnerability identified in ONLYOFFICE Document Server versions prior to 9.2.1. The vulnerability is classified under CWE-79, indicating improper neutralization of input during web page generation. Specifically, the issue exists in the Font field within the Multilevel list settings window of the Document Server interface. An attacker with low privileges (PR:L) can exploit this vulnerability remotely (AV:N) without requiring user interaction (UI:N). The vulnerability allows injection of malicious scripts that execute in the context of the victim's browser session, potentially leading to unauthorized access to sensitive information or manipulation of document content. The CVSS 3.1 vector indicates a scope change (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact includes limited confidentiality and integrity loss but no availability impact. Although no known exploits are reported in the wild, the vulnerability poses a risk in collaborative document environments where ONLYOFFICE is deployed. The lack of a patch link suggests that a fix may be forthcoming or pending release. The vulnerability highlights the importance of proper input validation and output encoding in web applications, especially those handling rich document editing features.

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
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.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 1 Jan 2026, 22:41 UTC

WeaknessesCWE-79

Technical details

References

Community reviews

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