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CVE-2025-66376 is a stored cross-site scripting vulnerability in the Classic UI of Zimbra Collaboration Suite. In Zimbra Collaboration 10.0 before 10.0.18 and 10.1 before 10.1.13, insufficient sanitization of attacker-controlled HTML email content permits malicious CSS @import directives and associated HTML constructs to bypass client-side filtering. When the crafted message is rendered, attacker-controlled JavaScript executes in the context of the victim's authenticated Zimbra webmail session.
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No public exploit code observed for this vulnerability.
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156 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A zero-day cross-site scripting vulnerability in Zimbra Collaboration Suite that enabled a zero-click email attack: malicious HTML embedded in an email could execute when a recipient opened or previewed it, enabling compromise of the webmail server and access to mailboxes and authentication data.
A vulnerability in certain Zimbra Collaboration Suite versions that can allow execution of malicious code when a user views a malicious email made to appear legitimate. Successful exploitation risks email and sensitive-data theft, unauthorized account access, and subsequent abuse of compromised accounts.
A Zimbra Collaboration Suite webmail vulnerability reportedly exploited through crafted emails in a zero-click phishing campaign, enabling compromise when a recipient views the email and allowing theft of email correspondence, session tokens, and credentials.
A vulnerability in Zimbra Collaboration Suite used in a zero-click or 'half-click' email espionage campaign, where viewing a crafted message in vulnerable Zimbra webmail was enough to trigger exploitation and enable theft of email, session tokens, and credentials.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.