CVE-2025-68936VulnerabilityPublished 25 Dec 2025

CVE-2025-68936: ONLYOFFICE Document Server · XSS or 'Cross-site Scripting'

Affects ONLYOFFICE Document ServerSource CVE Database V5

Not known to be exploited · CVSS 6.4 Medium.

Data as of 25 Oct 2026, 19:02 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.

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 2026-10-25.

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 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

1. Apply the official patch or upgrade ONLYOFFICE Document Server to version 9.2.1 or later as soon as it becomes available. 2. Restrict access to the Document Server to trusted networks and authenticated users only, minimizing exposure to untrusted actors. 3. Implement Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. 4. Deploy Web Application Firewalls (WAF) with rules specifically designed to detect and block XSS payloads targeting the Color theme name or similar input vectors. 5. Conduct regular security assessments and code reviews focusing on input validation and output encoding in web applications. 6. Educate users and administrators about the risks of XSS and encourage vigilance when interacting with document collaboration platforms. 7. Monitor logs and network traffic for unusual activities that could indicate exploitation attempts. 8. Consider isolating the Document Server environment or using containerization to limit the impact of potential compromises.

Description

CVE-2025-68936 is a medium severity Cross-site Scripting (XSS) vulnerability in ONLYOFFICE Document Server versions before 9.2.1. The flaw arises from improper neutralization of input in the Color theme name, allowing an attacker with low privileges to inject malicious scripts without user interaction. Exploitation can lead to partial compromise of confidentiality and integrity, but does not affect availability. There are no known exploits in the wild yet. European organizations using ONLYOFFICE Document Server should prioritize patching to prevent potential targeted attacks. Countries with higher adoption of ONLYOFFICE and significant document collaboration needs are at greater risk. Mitigation involves applying updates once available, restricting access to the Document Server, and implementing web application firewalls with XSS protections. This vulnerability requires low complexity to exploit but limited privileges, making it a moderate risk that should be addressed promptly.

Impact

For European organizations, this vulnerability poses a moderate risk to confidentiality and integrity of sensitive documents and user sessions managed via ONLYOFFICE Document Server. Exploitation could enable attackers to steal authentication tokens, execute unauthorized actions on behalf of users, or inject misleading content into documents. This is especially critical for sectors handling sensitive or regulated data such as finance, healthcare, and government. The lack of availability impact reduces the risk of service disruption but does not diminish the potential for data breaches or reputational damage. Organizations relying on ONLYOFFICE for document collaboration across multiple users or departments may face increased risk of lateral movement or privilege escalation if attackers leverage this XSS flaw. Given the medium CVSS score and ease of exploitation, timely remediation is essential to prevent targeted attacks, particularly in environments with remote or hybrid workforces common in Europe.

Summary

CVE-2025-68936 identifies a Cross-site Scripting (XSS) vulnerability in ONLYOFFICE Document Server versions prior to 9.2.1. The vulnerability stems from improper neutralization of user-supplied input in the Color theme name parameter during web page generation, classified under CWE-79. An attacker with low privileges (PR:L) can remotely exploit this issue over the network (AV:N) without requiring user interaction (UI:N). The vulnerability has a CVSS v3.1 base score of 6.4, indicating medium severity. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. Successful exploitation allows injection of malicious scripts that execute in the context of the victim's browser, potentially leading to partial disclosure of sensitive information (C:L) and modification of data integrity (I:L), but does not impact system availability (A:N). No patches or exploits are currently publicly available, but the vulnerability is documented and should be addressed proactively. The vulnerability is particularly relevant for environments where ONLYOFFICE Document Server is used for collaborative document editing and sharing, as malicious scripts could be used to hijack sessions, steal credentials, or manipulate document content.

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)

Community reviews

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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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