Medium 6.1Known exploited (CISA KEV)Published Jun 23, 2025

CVE-2025-48700An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1.

Updated under an hour ago (2026-10-19 11:10 UTC)

Does this affect you?

It affects synacor zimbra_collaboration_suite. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Apr 20, 2026; federal agencies had to remediate by Apr 23, 2026. Treat that date as your deadline.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for synacor zimbra_collaboration_suite

Exploited in the last 30 days

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.

CVSS: 6.1 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Added to CISA KEV Apr 20, 2026; federal remediation due Apr 23, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 1.71% (percentile 77)
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Apr 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

synacor zimbra_collaboration_suite synacor:zimbra_collaboration_suite	from 10.0.0 before 10.0.12; from 10.1.0 before 10.1.4; 8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; 8.8.15; and 86 more ranges	NVD

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.