Loading vulnerability…
CVE-2025-27915 is a stored cross-site scripting vulnerability in Zimbra Collaboration Suite 9.0, 10.0, and 10.1 Classic Web Client. Insufficient sanitization of HTML content in iCalendar (ICS) files permits a malicious calendar entry delivered by email to embed JavaScript. When the recipient views the message, an ontoggle event in a details element executes the script in the recipient’s authenticated Zimbra webmail session.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
If you can’t patch tonight, do this now.
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.
71 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stored cross-site-scripting vulnerability in Zimbra Classic Web Client, delivered through a crafted ICS calendar attachment. It was used as a zero-day to steal email and establish mail-forwarding rules against Brazilian military targets.
A Zimbra vulnerability cited as one of several webmail flaws targeted by TA458 in its espionage operations.
A zero-day cross-site scripting vulnerability in Zimbra webmail servers exploited by TA458 as part of its webmail-focused espionage operations.
A previously exploited vulnerability affecting Zimbra Collaboration Suite, mentioned as historical context for similar flaws.
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.