# CVE-2016-3408: Zimbra Collaboration XSS in unspecified component

Source: https://junglewise.ai/threats/cve-2016-3408-zimbra-collaboration-xss-in-unspecified-component  
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-2016-3408 · Severity: medium · CVSS 6.1 · Published 2017-01-18

Zimbra Collaboration is an enterprise-grade email and collaboration platform. A security vulnerability in versions prior to 8.7.0 allows remote attackers to perform cross-site scripting (XSS) attacks. If exploited, an attacker could execute malicious scripts in a user's browser session, potentially leading to the theft of login credentials, unauthorized access to emails, or the hijacking of user accounts.

Technologies: [Synacor Zimbra Collaboration Suite](https://junglewise.ai/threats/technologies/zimbra-collaboration-suite), [Zimbra Collaboration](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-2016-3408 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2016-3408 being exploited in the wild.

**How severe is CVE-2016-3408?** Medium severity, with a CVSS score of 6.1, published 18 January 2017.

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

**Is there a fix for CVE-2016-3408?** A patch was published on 2016-01-01: Zimbra Collaboration 8.7.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2016-3408 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2016-3408?** Check whether you run Synacor Zimbra Collaboration Suite or Zimbra Collaboration 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

A cross-site scripting (XSS) vulnerability exists in Zimbra Collaboration (formerly Zimbra Collaboration Suite) in versions prior to 8.7.0. The flaw is rooted in improper neutralization of user-supplied input during web page generation (CWE-79). A remote, unauthenticated attacker can exploit this by enticing a user to visit a specially crafted URL or interact with malicious HTML content. Successful exploitation allows the execution of arbitrary JavaScript in the context of the victim's browser session, which can be used to bypass same-origin policy protections and access sensitive session data. This issue is tracked internally by Zimbra as bug 101813 and was addressed in the 8.7.0 GA release.

## Affected products

- Zimbra Collaboration before 8.7.0

## Timeline

- 2016-01-01: patched: Zimbra Collaboration 8.7.0 released
- 2017-01-18: disclosed: NVD publication date

## References

- [http://www.securityfocus.com/bid/95923](http://www.securityfocus.com/bid/95923)
- [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)

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- [Zimbra Collaboration stored XSS in share notifications](https://junglewise.ai/threats/cve-2026-93642-an-unauthenticated-sender-can-forge-a-share-notification-that)
- [Zimbra Collaboration stored XSS in share notifications](https://junglewise.ai/threats/cve-2026-93641-an-unauthenticated-sender-can-forge-a-share-notification-that)
- [Synacor Zimbra Collaboration Suite XSS in Classic UI](https://junglewise.ai/threats/cve-2025-48700-synacor-zimbra-collaboration-suite-xss-in-classic-ui)
- [Synacor Zimbra Collaboration Suite SSRF in WebEx zimlet](https://junglewise.ai/threats/cve-2020-7796-synacor-zimbra-collaboration-suite-ssrf-in-webex-zimlet)
- [Synacor Zimbra Collaboration Suite stored XSS in Classic UI](https://junglewise.ai/threats/cve-2025-66376-synacor-zimbra-collaboration-suite-stored-xss-in-classic-ui)