CVE-2025-66376 - Synacor Zimbra Collaboration Suite (ZCS)
AI Vulnerability ContextZimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.
Overview
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CISA KEVyesWhether CISA lists this as exploited.
Techniques0AI attack methods connected to this vulnerability.
Case studies0Examples where this vulnerability is mentioned.
Vulnerability status
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CISA KEVHIGH
- CVE ID
- CVE-2025-66376
- Vendor/project
- Synacor
- Product
- Zimbra Collaboration Suite (ZCS)
- Vulnerability name
- Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
- Date added
- 2026-03-18
- Due date
- 2026-04-01
- Known ransomware campaign use
- Unknown
- CVSS v3
- 7.2
CWE-79
Exploit context
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No description available. The source record only contains identifiers and metadata.
Source evidence
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Original source
Original source links
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NVD CVE pagehttps://nvd.nist.gov/vuln/detail/CVE-2025-66376CVE API docshttps://nvd.nist.gov/developers/vulnerabilitiesData feedshttps://nvd.nist.gov/vuln/data-feedsCataloghttps://www.cisa.gov/known-exploited-vulnerabilities-catalogData repositoryhttps://github.com/cisagov/kev-datacve@mitre.orghttps://wiki.zimbra.com/wiki/Security_Centercve@mitre.orghttps://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixescve@mitre.orghttps://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixescve@mitre.orghttps://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policycve@mitre.orghttps://wiki.zimbra.com/wiki/Zimbra_Security_Advisories134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376