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CVE-2024-27443 is a stored cross-site scripting vulnerability in Zimbra Collaboration Suite 9.0 and 10.0 affecting the Classic Web Client’s handling of calendar invites. The flaw is caused by improper input validation and insufficient sanitization of calendar-related header data, including the X-Zimbra-Calendar-Intended-For header and the cif attribute used during CalendarInvite processing. An attacker can send a crafted email containing a malicious calendar header so that, when the message is viewed in the Zimbra classic webmail interface, attacker-controlled JavaScript executes in the context of the victim’s authenticated webmail session.
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What an attacker gets, and what they’ve been doing with it.
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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.
27 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 Zimbra XSS vulnerability that the article says has been exploited by threat actors.
A cross-site scripting (XSS) vulnerability in Roundcube and Zimbra webmail platforms, exploited for zero-click attacks by APT28.
A cross-site scripting (XSS) vulnerability in Zimbra webmail that was reportedly weaponized to enable zero-click style attacks leading to credential and email data theft via injected malicious code and abuse of the webmail API.
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.