CVE-2023-37580Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.
- 6.1MediumCVSS base score
- 49.1%Exploitation in 30 daysEPSS · top 1.1% of all CVEs
- YesKnown exploitedin CISA's KEV since 27 Jul 2023
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
Description
Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability.
- Added
- 27 Jul 2023
- Fix due (US federal)
- 17 Aug 2023
- Used by ransomware
- Not known
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 27 Jul 2023.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Nuclei template for it. CISA's SSVC rates its exploitation: it is being exploited.
Show the exploits1
Nuclei templates1 template
- Zimbra Collaboration Suite (ZCS) v.8.8.15 - Cross-Site Scripting (Nuclei template) (opens in a new tab)
http/cves/2023/CVE-2023-37580.yamlSeverity medium
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
- 20 days later
· 20 days later
Added to CISA KEV
Known exploited in the wild
- 4 days later
· 4 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVDNVD · Analyzed | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 49.1% · top 1.1% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.1.
Affected products
n/a
- affected n/a
References
References4
- https://wiki.zimbra.com/wiki/Security_Center (opens in a new tab)x_transferred
- https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy (opens in a new tab)x_transferred
- [oss-security] 20231117 CVE-2023-37580 (and others): XSS vulnerabilities in Zimbra Collaboration Suite (opens in a new tab)mailing-listx_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-37580 (opens in a new tab)government-resource
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2023-41465 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-37580)Record last updated .