Horizon Alert
Summary of the vulnerability and why it matters
A security flaw has been identified in the Roundcube webmail application. This vulnerability stems from how the application processes specific HTML email messages containing a crafted SVG document. Exploitation could enable an unauthorized party to execute arbitrary JavaScript code within the application's environment.
- Vulnerable component: Roundcube webmail
- Core weakness: Flawed HTML email processing
- Main business impact: Arbitrary JavaScript execution
Attack Path
How an attacker could exploit the issue
This vulnerability allows an attacker to inject malicious code into an organization's email system. Attackers can leverage this by sending specially crafted HTML emails containing malicious code. When these emails are processed by the vulnerable system, the malicious code can be executed, potentially leading to unauthorized access or data manipulation.
- Exposure: Email server receives HTML email.
- Attacker starting point: Remote attacker.
- Trigger and result: Malicious HTML email executes JavaScript.
Live Threat
Current exploitation, exposure, and threat context
A stored cross-site scripting vulnerability in Roundcube Webmail could permit remote attackers to inject arbitrary JavaScript code. This could occur through specially crafted HTML email messages containing SVG documents. The impact could lead to the execution of unauthorized scripts within the application's context, potentially affecting user sessions and data.
- Likely attacker skill level: High.
- Required access or conditions: Authenticated user.
- Business risk or urgency: High.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Roundcube Webmail may allow remote attackers to load arbitrary JavaScript code by sending a crafted HTML email with an SVG document. This could impact systems by allowing unauthorized script execution, potentially leading to data exposure or further compromise. Affected organizations should take steps to identify and mitigate this risk.
- Find Roundcube Webmail assets.
- Isolate or reduce exposure.
- Apply vendor fix and validate.
- Monitor for related issues.
