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CVE-2025-48700 is a cross-site scripting vulnerability in Zimbra Collaboration Suite affecting the Classic UI in versions 8.8.15, 9.0, 10.0, and 10.1 prior to the vendor fixes. The flaw is caused by insufficient sanitization of attacker-controlled HTML content rendered in email messages, including crafted tag structures and attribute values that can leverage @import directives and related script injection vectors. When a victim views a specially crafted email in the Classic UI, arbitrary JavaScript executes in the context of that user’s authenticated webmail session. The issue is effectively a stored, message-borne XSS condition and has been described as zero-click in the sense that no interaction beyond opening or viewing the email in the vulnerable interface is required.
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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.
25 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Zimbra XSS vulnerability affecting internet-exposed Zimbra Collaboration Suite instances and reportedly under ongoing attack.
Roundcube webmail vulnerability exploited in 2025 campaigns.
An unauthenticated cross-site scripting vulnerability in Zimbra Collaboration Suite that can expose sensitive information by executing arbitrary JavaScript in a user's session when a malicious email is viewed in the Classic UI.
A Zimbra Collaboration Suite cross-site scripting vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's session and access sensitive information, including via malicious email viewed in the Zimbra Classic UI.
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.