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CVE-2024-42010 is an information disclosure vulnerability in Roundcube Webmail affecting versions through 1.5.7 and 1.6.x through 1.6.7. The flaw is in the mod_css_styles functionality responsible for filtering Cascading Style Sheets in rendered email messages. Insufficient filtering of CSS token sequences allows a remotely supplied malicious email to cause unintended disclosure of sensitive information when the message is rendered in the victim’s webmail session.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a proof-of-concept (PoC) exploit for two vulnerabilities in Roundcube Webmail: CVE-2024-42008 (XSS via XML attachment) and CVE-2024-42010 (CSS injection for exfiltration). The repository contains two files: a README.md with detailed attack instructions and a Node.js script (roundcube-css-exploit.js) that acts as a malicious server to serve CSS and collect exfiltrated data. The exploit chain involves sending a crafted email with a malicious XML attachment and a CSS import referencing the attacker's server. When a victim opens the email, the CSS is loaded from the attacker's domain, which then exfiltrates the UID of the malicious attachment. The Node.js script implements endpoints (/start, /leak, /next, /end) to facilitate the exfiltration process. The exploit targets Roundcube Webmail and requires the attacker to host a server with a valid SSL certificate. The code is a functional PoC and demonstrates the attack chain but does not include weaponized payloads beyond exfiltration and XSS demonstration.
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Roundcube information disclosure vulnerability caused by insufficient CSS filtering in the mod_css_styles function.
Unknown
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Cross-references every affected SKU, including bundled OEM variants.
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