CVE-2022-37307 in OX App Suite
Summary
by MITRE • 12/26/2022
OX App Suite through 7.10.6 allows XSS via XHTML CDATA for a snippet, as demonstrated by the onerror attribute of an IMG element within an e-mail signature.
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Analysis
by VulDB Data Team • 06/18/2026
The vulnerability identified as CVE-2022-37307 represents a cross-site scripting flaw within the OX App Suite email client platform, specifically affecting versions through 7.10.6. This vulnerability stems from insufficient input validation and sanitization of XHTML content within email signatures, creating a pathway for malicious actors to execute arbitrary JavaScript code within the context of a victim's browser session. The flaw manifests when the application processes XHTML CDATA sections in email snippets, particularly when these sections contain unescaped HTML attributes that can be exploited to inject malicious payloads.
The technical exploitation of this vulnerability occurs through the manipulation of email signature fields that support XHTML formatting. Attackers can craft malicious email signatures containing an IMG element with an onerror attribute that triggers JavaScript execution when the image fails to load. This particular vector demonstrates how the application fails to properly sanitize user-supplied XHTML content, allowing the onerror event handler to be interpreted as executable code rather than plain text. The vulnerability specifically affects the snippet processing functionality where email content is rendered, creating an environment where untrusted input can be transformed into active code execution.
The operational impact of this vulnerability extends beyond simple script injection, as it enables attackers to perform a wide range of malicious activities within the victim's browser context. An attacker could potentially steal session cookies, redirect users to phishing sites, modify email content, or even execute more sophisticated attacks such as credential harvesting or privilege escalation within the application. The vulnerability is particularly concerning in enterprise environments where email signatures often contain rich formatting and where users may trust email content from known senders. The XSS vulnerability could be leveraged to compromise multiple users within an organization, especially if the email signature is displayed in a context that does not properly isolate the content.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and output encoding mechanisms for all user-supplied XHTML content. The application should enforce strict sanitization of HTML attributes and event handlers, particularly those that can trigger JavaScript execution such as onerror, onclick, and other DOM-based event handlers. Security measures should include the implementation of Content Security Policy headers that restrict script execution and prevent the loading of external resources that could contain malicious code. Additionally, the application should employ proper HTML escaping for all dynamic content and implement a whitelist-based approach for allowed XHTML elements and attributes. Organizations should also consider implementing regular security updates and patches to address this vulnerability, as the flaw exists in versions through 7.10.6 and likely affects other versions that have similar input handling mechanisms. This vulnerability aligns with CWE-79 which describes cross-site scripting flaws, and could be categorized under ATT&CK technique T1566 for phishing with malicious attachments or links, as the attack vector specifically targets email content and user interaction with email signatures.