What is CVE-2023-37580?
Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.
The record classifies CVE-2023-37580 under weakness class CWE-79. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 14 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1169 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.1 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS (FIRST)
- 49.0% probability of exploitation in the next 30 days, higher than 98.8% of all scored CVEs
- CISA KEV
- Listed since 2023-07-27, federal remediation deadline 2023-08-17
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2023-07-31, last modified 2025-10-30
Is CVE-2023-37580 being exploited?
CISA added CVE-2023-37580 to the Known Exploited Vulnerabilities catalog on 2023-07-27, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-08-17 under BOD 22-01. Weaponised exploit code for CVE-2023-37580 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2023/CVE-2023-37580.yaml). It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- Synacor: Zimbra Collaboration Suite, Zimbra Collaboration Suite 8.8.15
Showing 2 of 14 recorded product entries.
How to fix CVE-2023-37580
The record marks a vendor fix as available for CVE-2023-37580. Patch reference: http://www.openwall.com/lists/oss-security/2023/11/17/2. Because CVE-2023-37580 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-08-17. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2023-37580
1 tracked threat in the Threadlinqs corpus references CVE-2023-37580, either in the campaign’s CVE list or as an indicator on the campaign record.
- Zimbra Collaboration Suite Critical Stored XSS in Classic Web Client (Patched in ZCS 10.1.19) — CRITICAL · 2026-07-10
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.