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CVE-2016-3403

28
FAUCET Score

CVE-2016-3403 describes multiple Cross-Site Request Forgery (CSRF) vulnerabilities in the Zimbra Collaboration Admin Console, affecting versions prior to 8.6.0 Patch 8. These flaws allow remote attackers to hijack administrator authentication to add, modify, or remove accounts due to the absence of CSRF tokens and insufficient referer header checks. With a CVSS score of 8.8 (HIGH), this vulnerability has a high potential impact on confidentiality, integrity, and availability, requiring user interaction but with low attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.6.0CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.36%
Probability of exploitation in next 30 days
EPSS Percentile
68.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0136 is in the 68th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

wagopatch availablevia llm_extracted
Fixed in: ['8.6.0 Patch8', '8.7.0']

Vendor Advisories (1)

wagollm-wago-262fb0feb6d1d453HIGH

CSRF

References

bugzilla.zimbra.com / show_bug.cgi
Issue Tracking
bugzilla.zimbra.com / show_bug.cgi
Issue Tracking
seclists.org / fulldisclosure/2017/Jan/30
ExploitThird Party AdvisoryVDB Entry
sysdream.com / news/lab/2017-01-12-cve-2016-3403-multiple-csrf-in-zimbra-administration-interface
ExploitThird Party Advisory
wiki.zimbra.com / wiki/Zimbra_Releases/8.6_Patch_8
PatchRelease Notes
wiki.zimbra.com / wiki/Zimbra_Releases/8.7.0
Release Notes
wiki.zimbra.com / wiki/Zimbra_Security_Advisories
Vendor Advisory
securityfocus.com / bid/95383
Third Party AdvisoryVDB Entry