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CVE-2023-37580 is a cross-site scripting vulnerability affecting Zimbra Collaboration Suite 8.x, including ZCS 8 before 8.8.15 Patch 41, in the Zimbra Classic Web Client. The flaw allows indirect code injection through crafted content rendered by the Classic Web Client. Available reporting indicates exploitation can be triggered when a victim views attacker-controlled content, including specially crafted email messages, causing malicious JavaScript to execute in the context of the user’s authenticated webmail session. The issue was reported as affecting the 8.x branch broadly, and vendor guidance ultimately identified 8.8.15 Patch 41 as the corrective release.
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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.
5 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.
Vulnérabilité XSS (injection de code indirecte) dans Zimbra Collaboration Suite permettant une atteinte à l’intégrité et à la confidentialité des données; signalée comme activement exploitée.
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.