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Luu, T.J.

🔥 This vulnerability is being actively exploited in the wild (CISA Known Exploited Vulnerabilities catalog)

CVE-2025-48700: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability

infovulnerability🔥 Actively Exploited

security

Source: CISA Known Exploited VulnerabilitiesApril 19, 2026CVE-2025-48700

Summary

Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability (XSS, a flaw where attackers inject malicious code that runs in a user's browser). An attacker could use this to execute arbitrary JavaScript within a user's session, potentially stealing sensitive information or gaining unauthorized access.

Solution / Mitigation

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. See vendor security advisories at https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories for specific patches and updates.

Vulnerability Details

EPSS (30-day exploit probability)

EPSS: 0.2%

Patch Available

Yes

Exploit Maturity

🔥 Actively Exploited

Disclosure Date

April 19, 2026

Classification

Attack SophisticationModerate

Taxonomy References

CWE (Weakness Type)

CWE-79

CAPEC (Attack Pattern)

CAPEC-198 CAPEC-86

Monthly digest — independent AI security research

Original source: https://nvd.nist.gov/vuln/detail/CVE-2025-48700

First tracked: April 20, 2026 at 08:00 PM

Classified by LLM (prompt v3) · confidence: 95%