Key points
- Versions prior to 1.6.20 and 1.7.5 contain multiple security flaws.
- Fixes address IMAP command injection via the _uid parameter.
- Updates also resolve XSS, SSRF, and header injection issues.
Roundcube webmail released security updates on Oct 19 for versions 1.6.20 and 1.7.5. These releases address multiple vulnerabilities identified in earlier builds. According to the oss-security mailing list, the flaws include command injection, cross-site scripting, and server-side request forgery. The update announcement lists specific fixes for these issues.
In plain English
The most significant flaw allows attackers to inject IMAP commands. This happens through a specific parameter in the mail viewing actions. A researcher named Wahab “NeoX” K. reported this issue to the vendor. The vulnerability exists in the _uid parameter used by the mail/headers and mail/viewsource features. Attackers could potentially manipulate email header processing.
The background
The security update was posted to the oss-security mailing list on Oct 20. The advisory cites the official release announcement from the Roundcube website. The update covers both the long-term support branch and the newer development branch. Previous versions before these specific release numbers are affected. The vendor has provided the code to mitigate these risks.
What changes now
Administrators running older versions must upgrade to the latest releases. The 1.6.20 version is the updated long-term support release. The 1.7.5 version is the updated current release. These updates remove the code paths that allowed injection. Users of prior versions remain exposed to the reported vulnerabilities until they apply the patch.
Who needs to act first
Teams should prioritize systems exposed to untrusted users or external networks. Check if your instance processes emails from unknown sources. Test the update in a staging environment before applying it to production. Back up your database and configuration files immediately. If you cannot patch right away, consider restricting access to the web interface. Monitor logs for unusual IMAP command activity.
Background: Cross-site scripting (XSS)
Cross-site scripting (XSS) involves injecting malicious scripts into web pages viewed by other users. Cross-site request forgery (CSRF) forces an authenticated user to execute unwanted actions on a trusted site. XSS steals data or hijacks sessions; CSRF performs actions on behalf of the victim using their existing credentials.
Read the full guide: Difference Between Cross Site Scripting and Request Forgery: Core Mechanics
What to do and how to stay safe: Roundcube
- Verify your current Roundcube version against the affected list.
- Schedule an immediate upgrade to 1.6.20 or 1.7.5.
- Review server logs for signs of command injection attempts.
- Restrict access to the webmail interface if patching is delayed.
Step-by-step guide: 7 Configuration Errors That Expose Systems to Zero-Day Exploits
General security guidance from the Vuln Post newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Which versions of Roundcube are affected?
Versions prior to 1.6.20 and 1.7.5 are affected by these vulnerabilities.
Is there a fix available?
Yes, the vendor released security updates on Oct 19 for both branches.
What type of vulnerability is the most severe?
The advisory highlights an IMAP command injection flaw as a key issue.
