PatchSiren

PatchSiren cyber security CVE debrief

CVE-2016-3412 Synacor CVE debrief

CVE-2016-3412 describes multiple cross-site scripting (XSS) vulnerabilities in Zimbra Collaboration before 8.7.0. The issue is rated medium severity and is mainly a web-facing risk: an attacker can get arbitrary script or HTML processed in a user’s browser through unspecified vectors. Because the attack requires user interaction and affects browser content, the primary concern is session exposure, content tampering, and user-directed phishing within Zimbra web workflows.

Vendor
Synacor
Product
CVE-2016-3412
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2017-01-18
Original CVE updated
2026-05-13
Advisory published
2017-01-18
Advisory updated
2026-05-13

Who should care

Organizations running Zimbra Collaboration before 8.7.0, especially internet-facing mail and collaboration deployments, should treat this as relevant. Administrators, security teams, and end users who rely on Zimbra webmail or browser-based admin functions are the main audience.

Technical summary

The supplied NVD data maps CVE-2016-3412 to CWE-79 and classifies it with CVSS 3.0 vector CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. That means the issue is reachable over the network, does not require privileges, but does require user interaction. The CVE description identifies multiple XSS bugs in Zimbra Collaboration prior to 8.7.0, while the NVD CPE data marks affected versions up to 8.6.0. The available source references point to Zimbra release notes and vendor advisories, supporting the remediation boundary around 8.7.0.

Defensive priority

Medium overall; high priority for exposed or widely used Zimbra deployments because the issue is network-reachable, user-interactive, and affects browser-delivered content.

Recommended defensive actions

  • Upgrade Zimbra Collaboration to 8.7.0 or later, using the vendor release notes and advisories as the remediation reference.
  • Review Zimbra web-facing interfaces for XSS exposure patterns, especially any customizations, templates, or integrations that render user-controlled content.
  • Reduce exposure of admin and user portals where possible, and require strong authentication for any browser-based management access.
  • Remind users not to trust unexpected links or content delivered through Zimbra until remediation is complete.
  • Validate the environment against the affected version range identified in NVD (up to 8.6.0) and confirm no older instances remain deployed.

Evidence notes

The CVE description states that multiple XSS vulnerabilities affect Zimbra Collaboration before 8.7.0. NVD classifies the weakness as CWE-79 and lists the affected CPE range as Zimbra Collaboration Suite versions through 8.6.0. The linked Zimbra 8.7.0 release notes and Zimbra Security Advisories provide the official vendor-side remediation context. No KEV listing is present in the supplied data.

Official resources

CVE-2016-3412 was publicly published in the supplied record on 2017-01-18 and later modified in NVD on 2026-05-13. No KEV addition is included in the supplied data.