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CVE-2020-35730 is a stored cross-site scripting vulnerability in Roundcube Webmail affecting versions before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The flaw is triggered when Roundcube processes a plain-text email containing JavaScript embedded in a link reference element. The vulnerable handling occurs in linkref_addindex within rcube_string_replacer.php, which mishandles the crafted link reference and allows attacker-supplied script to be injected into the rendered webmail view. Because the payload is delivered inside an email message and executes in the context of the victim’s authenticated Roundcube session, the issue can be used to run arbitrary JavaScript within the webmail window when the message is opened.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Cross-site scripting vulnerability in Roundcube Webmail used as initial access via crafted email viewed in the webmail interface.
A medium-severity cross-site scripting (XSS) vulnerability in Roundcube webmail software that allows attackers to execute malicious JavaScript in the context of the victim's browser session.
A stored cross-site scripting (XSS) vulnerability in Roundcube webmail that allows attacker-supplied JavaScript embedded in an email body to execute in the victim’s webmail session context when the email is viewed, enabling credential and email data theft.
A Roundcube webmail vulnerability reportedly abused by APT28 for reconnaissance and data gathering.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.