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CVE-2023-34192

95
FAUCET Score

CVE-2023-34192 is a critical Cross-Site Scripting (XSS) vulnerability affecting Zimbra Collaboration Suite (ZCS) version 8.8.15. An authenticated attacker can exploit this by injecting a crafted script into the /h/autoSaveDraft function, leading to arbitrary code execution. With a CVSS score of 9.0 (CRITICAL), this vulnerability is remotely exploitable with low attack complexity, requiring user interaction, and can result in high impact to confidentiality, integrity, and availability. This CVE is actively exploited (KEV listed), has a high EPSS score, and has garnered significant community attention, though no public Metasploit or ExploitDB modules are currently available.

Impacted Technologies

VendorProductVersion(s)CPE
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:-:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p1:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p10:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p11:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p12:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.0CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.3
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
77.27%
Probability of exploitation in next 30 days
EPSS Percentile
99.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Feb 25, 2025
Nuclei: CVE-2023-34192 · Jul 20, 2023
This CVE's current EPSS score of 0.7727 is in the 100th percentile among its peer group of 265 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.6 Bluesky, 0.3 Mastodon, and 1.6 GitHub mentions.

Media Mentions

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

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
wiki.zimbra.com / wiki/Security_Center
Release NotesVendor Advisory
wiki.zimbra.com / wiki/Zimbra_Responsible_Disclosure_Policy
Not Applicable
wiki.zimbra.com / wiki/Zimbra_Security_Advisories
Vendor Advisory