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Date: Tue, 31 Oct 2023 23:26:12 +0200
From: Valtteri Vuorikoski <>
Subject: CVE-2023-5631: XSS vulnerability in Roundcube webmail

Not associated with the project or ESET, but didn't see anything here about
this yet.

Roundcube is an open-source webmail client. Versions up to 1.6.4 are
vulnerable (including the 1.4.x and 1.5.x series) to an XSS exploit
caused by an issue in the sanitization of SVG image elements in HTML
emails. ESET describes CVE-2023-5631 as follows in their press release
at <>:

  By sending a specially crafted email message, attackers are able to
  load arbitrary JavaScript code in the context of the Roundcube user’s
  browser window. No manual interaction other than viewing the message
  in a web browser is required. The final JavaScript payload can
  exfiltrate email messages to the command and control server of the

The Roundcube project has released new versions for each of the abovementioned
release series. The official release notification is at

According to ESET, the vulnerability is being actively exploited to
target "governmental entities in Europe".


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