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CVE-2025-27915 is a stored cross-site scripting vulnerability in Zimbra Collaboration Suite affecting the Classic Web Client in ZCS 9.0, 10.0, and 10.1. The flaw is caused by insufficient sanitization of HTML content embedded in iCalendar (ICS) files. When a user opens an email containing a crafted ICS entry in the Classic Web Client, attacker-supplied JavaScript can execute in the victim’s browser session, including via an event handler embedded in a HTML details element. Because the script runs in the context of the authenticated webmail session, the vulnerability can be used to interact with mailbox data and account functionality as the victim user.
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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.
63 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously exploited vulnerability affecting Zimbra Collaboration Suite, mentioned as historical context for similar flaws.
A stored XSS flaw in Zimbra Classic Web Client that was alleged to have been exploited as a zero-day against the Brazilian military, though Zimbra said it found no evidence supporting that claim.
A CVE referenced only as an example template for extractor syntax; no vulnerability details are provided in the content.
A Zimbra XSS vulnerability exploited as a zero-day to execute arbitrary JavaScript and create malicious email filters that forward messages to attacker-controlled servers.
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.