What is CVE-2025-48700?

CVE-2025-48700 is a medium-severity vulnerability in Synacor Zimbra_collaboration_suite, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-06-23.

How severe is CVE-2025-48700?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2025-48700 known to be exploited?

Yes. CVE-2025-48700 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-20), indicating it is being actively exploited.

XSS in Synacor Zimbra_collaboration_suite

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, potenti…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.018 (75.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Synacor Zimbra_collaboration_suite — versions 8.8.15, 9.0.0
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-04-20. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-04-23.

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.

References

cve@mitre.org (Vendor Advisory)
cve@mitre.org (Release Notes)
cve@mitre.org (Product)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2025-48700?: CVE-2025-48700 is a medium-severity vulnerability in Synacor Zimbra_collaboration_suite, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-06-23.
How severe is CVE-2025-48700?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2025-48700 known to be exploited?: Yes. CVE-2025-48700 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-20), indicating it is being actively exploited.