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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: Stored Cross-Site Scripting (XSS) in Roundcube Webmail. 📉 **Consequences**: Attackers inject malicious scripts via crafted `text/plain` emails.…
🛡️ **Root Cause**: Flaw in `program/lib/Roundcube/rcube_string_replacer.php`. 🔍 **Flaw**: The component fails to properly sanitize or escape links within plain text email messages.…
💻 **Attacker Capabilities**:
• Execute arbitrary JavaScript in the victim's context.
• Steal sensitive user data (cookies, credentials).
• Perform actions as the authenticated user (e.g., send emails, modify contacts).
…
⚠️ **Exploitation Threshold**: **Low**.
• **Auth**: Requires the victim to be logged into Roundcube.
• **Config**: No special server config needed; just sending a crafted email is sufficient.…
🔓 **Public Exploits**: **YES**. Multiple PoCs are available on GitHub (e.g., `s3cb0y/CVE-2023-43770-POC`, `knight0x07/CVE-2023-43770-PoC`). These scripts automate sending the crafted email to trigger the stored XSS.
Q7How to self-check? (Features/Scanning)
🔍 **Self-Check**:
1. Check your Roundcube version against the affected list.
2. Scan for emails containing suspicious links in `text/plain` format.
3. Use automated scanners that detect XSS in email clients.
4.…
✅ **Official Fix**: **YES**. Fixed in Roundcube **1.6.3**, **1.5.4**, and **1.4.14**. The commit `e92ec206a886461245e1672d8530cc93c618a49b` addresses the sanitization issue. Update immediately to these versions or later.
Q9What if no patch? (Workaround)
🚧 **No Patch Workaround**:
• **Disable Plain Text Viewing**: If possible, force HTML-only viewing (though this may break functionality).…