CVE-2025-53831 in DrawIO for ownCloud
Summary
by MITRE • 07/06/2026
DrawIO for ownCloud is an application for using DrawIO with the file storage, synchronization, and sharing application ownCloud Classic. In DrawIO for ownCloud prior to version 1.0.2, which corresponds to ownCloud 10 prior to version 10.15.3, attackers with access to the DrawIO app can leverage improper neutralization of input during web page generation to achieve stored XSS. Upgrade ownCloud 10 to version 10.15.3 or later or upgrade DrawIO for ownCloud 10 to version 1.0.2 or later to receive a patch.
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Analysis
by VulDB Data Team • 07/06/2026
The vulnerability identified in DrawIO for ownCloud represents a critical stored cross-site scripting flaw that emerged from improper input validation during web page generation processes. This security weakness affects versions prior to 1.0.2 of the DrawIO application, which corresponds to ownCloud 10 versions before 10.15.3, creating a persistent threat vector within collaborative document environments where users can inject malicious scripts into shared content. The vulnerability stems from insufficient sanitization of user-supplied data that is subsequently rendered in web pages without adequate protection mechanisms.
The technical implementation of this flaw allows attackers with access to the DrawIO application to store malicious JavaScript payloads within the file storage system of ownCloud, which then executes whenever other users view the compromised diagrams or documents. This stored XSS vulnerability operates through the improper neutralization of input during web page generation, where user-controllable data flows directly into HTML output without proper encoding or filtering. The attack vector exploits the application's failure to adequately validate and sanitize content before rendering it in browser contexts, creating a persistent threat that remains active until the malicious content is removed or the system is updated.
From an operational perspective, this vulnerability enables attackers to execute arbitrary JavaScript code within the context of other users' browsers, potentially leading to session hijacking, credential theft, data exfiltration, and further lateral movement within the affected environment. The impact extends beyond individual compromised sessions to potentially affect entire user bases within shared ownCloud instances where DrawIO functionality is enabled. The stored nature of this vulnerability means that malicious payloads remain active indefinitely until manually removed or patched, creating a persistent threat that can be exploited repeatedly by attackers.
The mitigation strategy involves upgrading to patched versions of both the ownCloud 10 platform and the DrawIO for ownCloud application, specifically targeting version 10.15.3 or later for ownCloud 10 and version 1.0.2 or later for DrawIO for ownCloud. This upgrade addresses the root cause by implementing proper input validation and output encoding mechanisms that prevent malicious data from being executed as scripts within browser contexts. Organizations should also consider implementing additional security measures such as content security policies, regular vulnerability assessments, and monitoring for suspicious user activities within their ownCloud environments to further reduce risk exposure.
This vulnerability aligns with CWE-79 which identifies cross-site scripting flaws in web applications, and represents a classic example of how insufficient input validation can create persistent security risks. The ATT&CK framework categorizes this as a technique for code injection and credential access, potentially enabling adversaries to establish persistent access through session manipulation and data theft operations. Organizations should prioritize immediate remediation of this vulnerability while maintaining awareness of similar input validation flaws that may exist in other collaborative platforms and web applications within their infrastructure ecosystems.