CVE-2023-37580

Name: CVE-2023-37580
Creator: NVD / NIST
Published: 2023-07-31T16:15:10.327+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10Actively ExploitedEPSS 59.04%

Last modified Jun 17, 2026

CVE-2023-37580 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.. CISA has confirmed active exploitation in the wild. EPSS estimates a 59.04% chance of exploitation in the next 30 days.

Description

Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

59.04%

99.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Aug 17, 2023.

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Synacor	Zimbra Collaboration Suite	>= 8.8.0, < 8.8.15	—
Synacor	Zimbra Collaboration Suite	8.8.15	P11

References

http://www.openwall.com/lists/oss-security/2023/11/17/2Mailing List, Patch
https://wiki.zimbra.com/wiki/Security_CenterRelease Notes
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_PolicyNot Applicable
http://www.openwall.com/lists/oss-security/2023/11/17/2Mailing List, Patch
https://wiki.zimbra.com/wiki/Security_CenterRelease Notes
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_PolicyNot Applicable
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-37580US Government Resource

Timeline

Published: Jul 31, 2023
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-37580?

Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.

How severe is CVE-2023-37580?

CVE-2023-37580 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 59.04% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2023-37580?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-37580?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST