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CVE-2018-10939

20
FAUCET Score

CVE-2018-10939 describes a persistent cross-site scripting (XSS) vulnerability in the Zimbra Web Client (ZWC) affecting Zimbra Collaboration Suite versions 8.8 prior to 8.8.8.Patch4 and 8.7 prior to 8.7.11.Patch4. This medium-severity vulnerability (CVSS 6.1) allows an unauthenticated attacker to execute arbitrary scripts in a victim's browser through a crafted contact group, requiring user interaction. While the potential impact includes limited confidentiality and integrity compromise, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.7.0, <= 8.7.11CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
>= 8.8.0, <= 8.8.8CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
8.7.11CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p1:*:*:*:*:*:*
8.7.11CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p2:*:*:*:*:*:*
8.7.11CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.7.11:p3:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.44%
Probability of exploitation in next 30 days
EPSS Percentile
70.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0143 is in the 83rd percentile among its peer group of 26,236 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

blog.zimbra.com / 2018/05/new-zimbra-patches-8-8-8-patch-4-and-8-7-11-patch-4
PatchVendor Advisory
wiki.zimbra.com / wiki/Security_Center
PatchVendor Advisory
wiki.zimbra.com / wiki/Zimbra_Releases/8.7.11/P4
PatchRelease NotesVendor Advisory
wiki.zimbra.com / wiki/Zimbra_Releases/8.8.8/P4
PatchRelease NotesVendor Advisory
wiki.zimbra.com / wiki/Zimbra_Security_Advisories
PatchVendor Advisory