# CVE-2016-3407: Zimbra Collaboration multiple XSS vulnerabilities

Source: https://junglewise.ai/threats/cve-2016-3407-zimbra-collaboration-multiple-xss-vulnerabilities  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2017-01-18. Updated: 2026-05-13  
License: CC BY 4.0 with a link back

CVE-2016-3407 · Severity: medium · CVSS 6.1 · Published 2017-01-18

Zimbra Collaboration, a widely used enterprise email and collaboration platform, is affected by multiple security flaws that allow attackers to run malicious scripts in a user's browser. By tricking a user into clicking a link or viewing a specially crafted page, an attacker could potentially steal login session information or perform actions on behalf of the user. This could lead to unauthorized access to corporate email accounts and sensitive internal communications.

Technologies: [Synacor Zimbra Collaboration Suite](https://junglewise.ai/threats/technologies/zimbra-collaboration-suite), [Zimbra Collaboration Suite](https://junglewise.ai/threats/technologies/collaboration). Vendors: [Synacor](https://junglewise.ai/threats/vendors/synacor), [Zimbra](https://junglewise.ai/threats/vendors/zimbra).

## Quick answers

**Is CVE-2016-3407 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2016-3407 being exploited in the wild.

**How severe is CVE-2016-3407?** Medium severity, with a CVSS score of 6.1, published 18 January 2017.

**Which products and versions are affected?** Zimbra Collaboration Suite before 8.7.0.

**Is there a fix for CVE-2016-3407?** A patch was published on 2016-07-13: Zimbra 8.7.0 GA release date Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2016-3407 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2016-3407?** Check whether you run Synacor Zimbra Collaboration Suite or Zimbra Collaboration Suite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

Multiple cross-site scripting (XSS) vulnerabilities exist in Zimbra Collaboration Suite (ZCS) versions prior to 8.7.0. The vulnerabilities, tracked internally by Zimbra as bugs 104222, 104910, 105071, and 105175, stem from improper neutralization of user-supplied input during web page generation. A remote, unauthenticated attacker can exploit these flaws by persuading a user to visit a malicious URL or interact with crafted content. Successful exploitation allows the execution of arbitrary JavaScript in the context of the victim's browser session, potentially leading to session hijacking, credential theft, or unauthorized administrative actions. The issues are resolved in Zimbra Collaboration 8.7.0 GA.

## Affected products

- Zimbra Zimbra Collaboration Suite before 8.7.0

## Timeline

- 2017-01-18: advisory: NVD publication date
- 2016-07-13: patched: Zimbra 8.7.0 GA release date

## References

- [http://www.securityfocus.com/bid/95897](http://www.securityfocus.com/bid/95897)
- [https://wiki.zimbra.com/wiki/Zimbra_Releases/8.7.0](https://wiki.zimbra.com/wiki/Zimbra_Releases/8.7.0)
- [https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories](https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories)

## Related threats

- [Zimbra Collaboration Suite local privilege escalation in dnscache](https://junglewise.ai/threats/cve-2026-93640-a-local-privilege-escalation-vulnerability-in-the-optional)
- [Zimbra Collaboration Suite authorization bypass in Zimlet configuration](https://junglewise.ai/threats/cve-2026-93639-a-missing-authorization-vulnerability-in-zimbra-collaboration)
- [Zimbra Collaboration Suite reflected cross-site scripting in login](https://junglewise.ai/threats/cve-2026-93638-a-reflected-cross-site-scripting-vulnerability-in-the-login-page)
- [Zimbra Collaboration Suite LDAP filter injection](https://junglewise.ai/threats/cve-2026-93636-an-ldap-filter-injection-vulnerability-in-zimbra-collaboration)
- [Zimbra Collaboration Suite cross-account authorization bypass in FileSharedWithMeRequest](https://junglewise.ai/threats/cve-2026-93634-a-cross-account-authorization-vulnerability-in-zimbra)