CVE detail
CVE-2025-48700: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
Source: CISA Known Exploited Vulnerabilities catalog · back to feed
Vendor / product
Synacor · Zimbra Collaboration Suite (ZCS)
- Date added (KEV)
- Apr 20, 2026
- CISA due date
- Apr 23, 2026
- Ransomware campaign use
- Unknown
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor fix: Vendor advisory
Scorifya interpretation
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Plain English
Technical detail
From CISA
Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that could allow attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information.
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-48700
References
- https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
- https://wiki.zimbra.com/wiki/Security_CenterRelease Notes
- https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_PolicyProduct
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-48700US Government Resource
Other recent CVEs from Synacor
- CVE-2025-66376Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
- CVE-2020-7796Zimbra Collaboration Suite — Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability
- CVE-2025-68645Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability
- CVE-2025-27915Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
- CVE-2019-9621Zimbra Collaboration Suite (ZCS) — Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability
Check your domain's public posture
Scorifya doesn't test for specific CVEs, but if patching Synacor changed your headers or TLS, a fresh hardening scan helps confirm nothing regressed externally.