HOMEVULNERABILITIESCVE-2016-3403
HIGH

CVE-2016-3403

CWE-352Published: May 17, 2017· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Multiple cross-site request forgery (CSRF) vulnerabilities in the Admin Console in Zimbra Collaboration before 8.6.0 Patch 8 allow remote attackers to hijack the authentication of administrators for requests that (1) add, (2) modify, or (3) remove accounts by leveraging failure to use of a CSRF token and perform referer header checks, aka bugs 100885 and 100899.

NVD Source

Technical Analysis

CVE-2016-3403 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

synacor1 product(s)
zimbra collaboration suite
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://wiki.zimbra.com/wiki/Zimbra_Releases/8.6_Patch_8
PATCHhttps://wiki.zimbra.com/wiki/Zimbra_Releases/8.6_Patch_8
ADVISORYhttp://seclists.org/fulldisclosure/2017/Jan/30
ADVISORYhttp://www.securityfocus.com/bid/95383
ADVISORYhttps://sysdream.com/news/lab/2017-01-12-cve-2016-3403-multiple-csrf-in-zimbra-administration-interface/
ADVISORYhttps://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
ADVISORYhttp://seclists.org/fulldisclosure/2017/Jan/30
ADVISORYhttp://www.securityfocus.com/bid/95383
ADVISORYhttps://sysdream.com/news/lab/2017-01-12-cve-2016-3403-multiple-csrf-in-zimbra-administration-interface/
ADVISORYhttps://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

All References (16)

→
http://seclists.org/fulldisclosure/2017/Jan/30Exploit · Third Party Advisory · VDB Entry
→
http://www.securityfocus.com/bid/95383Third Party Advisory · VDB Entry
→
https://bugzilla.zimbra.com/show_bug.cgi?id=100885Issue Tracking
→
https://bugzilla.zimbra.com/show_bug.cgi?id=100899Issue Tracking
→
https://sysdream.com/news/lab/2017-01-12-cve-2016-3403-multiple-csrf-in-zimbra-administration-interface/Exploit · Third Party Advisory
→
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.6_Patch_8Patch · Release Notes
→
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.7.0Release Notes
→
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
→
http://seclists.org/fulldisclosure/2017/Jan/30Exploit · Third Party Advisory · VDB Entry
→
http://www.securityfocus.com/bid/95383Third Party Advisory · VDB Entry
→
https://bugzilla.zimbra.com/show_bug.cgi?id=100885Issue Tracking
→
https://bugzilla.zimbra.com/show_bug.cgi?id=100899Issue Tracking
→
https://sysdream.com/news/lab/2017-01-12-cve-2016-3403-multiple-csrf-in-zimbra-administration-interface/Exploit · Third Party Advisory
→
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.6_Patch_8Patch · Release Notes
→
https://wiki.zimbra.com/wiki/Zimbra_Releases/8.7.0Release Notes

Quick Facts

CVE IDCVE-2016-3403
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-352
CISA KEVNo
Affected1 vendor(s)
PublishedMay 17, 2017

Related CVEs (CWE-352)

CVE-2025-23922
10.0
CVE-2017-5145
10.0
CVE-2025-32642
10.0
CVE-2024-29684
9.8
CVE-2024-33449
9.8
CVE-2024-34502
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-3403 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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