CVE-2025-48700 KEV
6.1
MEDIUM · CVSS 3.1 · EPSS 1.7% (pctl 76)
Patch first
On CISA KEV — known exploited in the wild, due 2026-04-23.
Description
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.
Scoring
| CVSS | 6.1 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| EPSS | 1.71% — more likely to be exploited than 76% of all CVEs |
| Weakness | CWE-79 |
| On CISA KEV | yes — remediate by 2026-04-23 |
| Public exploit | none known |
| Published | 2025-06-23 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability |
|---|---|
| Added | 2026-04-20 |
| Due | 2026-04-23 |
| Vendor / product | Synacor / Zimbra Collaboration Suite (ZCS) |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| synacor | zimbra collaboration suite |
References
→ the Explorer · watch your stack · NVD