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CVE-2023-37580

87
FAUCET Score

CVE-2023-37580 is a Cross-Site Scripting (XSS) vulnerability affecting Zimbra Collaboration Suite (ZCS) 8 prior to version 8.8.15 Patch 41, specifically within the Zimbra Classic Web Client. This medium-severity vulnerability (CVSS 6.1) can be exploited remotely with low complexity, requiring user interaction, and could lead to limited compromise of confidentiality and integrity. Notably, this CVE is actively exploited in the wild, with evidence of nation-state actors leveraging it against government organizations, and has garnered significant community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.8.0, < 8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
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:p26:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p3:*:*:*:*:*:*
8.8.15CPE matchmatch criteria
cpe:2.3:a:synacor:zimbra_collaboration_suite:8.8.15:p30:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
54.54%
Probability of exploitation in next 30 days
EPSS Percentile
98.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Jul 27, 2023
Nuclei: CVE-2023-37580 · Aug 1, 2023
This CVE's current EPSS score of 0.5454 is in the 100th percentile among its peer group of 26,234 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

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

Remediation

Patch Available

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 Notes
wiki.zimbra.com / wiki/Zimbra_Responsible_Disclosure_Policy
Not Applicable
openwall.com / lists/oss-security/2023/11/17/2
Mailing ListPatch