# CVE-2025-48700

An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1. A Cross-Site Scripting (XSS) vulnerability in the Zimbra Classic UI allows attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information. This issue arises from insufficient sanitization of HTML content, specifically involving crafted tag structures and attribute values that include an @import directive and other script injection vectors. The vulnerability is triggered when a user views a crafted e-mail message in the Classic UI, requiring no additional user interaction.

- Page: https://www.vulneraibility.com/cve/CVE-2025-48700
- CVSS: 6.1
- Known exploited: yes, in CISA KEV since 2026-04-20; CISA due date 2026-04-23
- EPSS: 1.71%
- CISA SSVC: exploitation active, automatable no, technical impact partial (assessed 2026-04-20)
- Weakness: CWE-79
- Published: 2025-06-23

## Affected

- synacor:zimbra_collaboration_suite

## References

- [other] https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
- [other] https://wiki.zimbra.com/wiki/Security_Center
- [other] https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-48700

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.