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CVE-2020-35730 is a stored cross-site scripting vulnerability in Roundcube Webmail affecting versions before 1.2.13, the 1.3 branch before 1.3.16, and the 1.4 branch before 1.4.10. The linkref_addindex function improperly handles a link reference element containing JavaScript in a plain-text email. Opening a crafted message in a vulnerable Roundcube interface can execute attacker-controlled JavaScript in the victim’s webmail context. APT28/Sednit and Winter Vivern exploited the vulnerability in espionage campaigns during 2023.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Roundcube Webmail vulnerability reportedly abused by APT28 to breach Ukrainian government email systems.
Cross-site scripting vulnerability in Roundcube Webmail used as initial access via crafted email viewed in the webmail interface.
A Roundcube vulnerability identified as an exploited initial-access flaw in the campaign discussion. The article collectively associates the listed Roundcube flaws with arbitrary shell-command execution through Visual Basic scripts, without explaining this vulnerability's individual mechanism.
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.
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.