CVE-2023-5631 Roundcube Webmail: web page flaw
In plain words: A web app can be made to act on someone's behalf or reach places it should not. Stolen sessions, actions taken as the victim, or access to internal systems.
Confirmed exploited by CISA on · US federal patch deadline Nov 16, 2023
What to do
- Install Roundcube's security update for Webmail. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
- Product
- Roundcube Webmail
- CISA description
- Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that allows a remote attacker to run malicious JavaScript code.
- Type of flaw
- Web page flaw (CWE-79)
- Confirmed exploited
- Oct 26, 2023
- US federal patch deadline
- Nov 16, 2023
Ask Cleus about it
Ask about a vulnerability, an update, a weird message, or the news. Plain-word answers, free, no account.
Answering about CVE-2023-5631 ·
Questions about CVE-2023-5631
Is CVE-2023-5631 being exploited?
Yes. CISA added CVE-2023-5631 to its Known Exploited Vulnerabilities catalog on Oct 26, 2023, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2023-5631?
Install Roundcube's security update for Webmail. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2023-5631?
Only if you use Roundcube Webmail. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.