[Update] Vulnerability in Zimbra Collaboration Suite (July 17, 2023)
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
[Update on July 26, 2023] Security patch released by the vendor On July 26, 2023, the vendor released a security patch [1] for this vulnerability registered as CVE-2023-37580. It is therefore strongly recommended to deploy patch P41 for all versions...
CSIRTS triage
- What
- A vulnerability has been identified that requires a security patch.
- Who is affected
- Users of Zimbra Collaboration Suite who have not applied the latest updates.
- Urgency
- Remediation is important as the vulnerability is being actively exploited.
- Action
- Deploy patch P41 for all versions of Zimbra Collaboration Suite.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/alerte/CERTFR-2023-ALE-007/
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2023-37580Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2023-37580 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalexploitedCVE-2023-37580: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerabilitycisa-kev
Recent advisories for Zimbra Collaboration Suite
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalexploitedCVE-2025-48700: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerabilitycisa-kev · 2026-04-20
- criticalexploitedCVE-2025-66376: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerabilitycisa-kev · 2026-03-18
- criticalexploitedCVE-2020-7796: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerabilitycisa-kev · 2026-02-17
- criticalexploitedCVE-2025-68645: Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerabilitycisa-kev · 2026-01-22
- criticalexploitedCVE-2025-27915: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerabilitycisa-kev · 2025-10-07
- criticalexploitedCVE-2019-9621: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerabilitycisa-kev · 2025-07-07
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