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Vulnerability details

CVE-2025-48700

Actively exploited
Synacor Zimbra Collaboration Suite (ZCS)
CVSS 3.1
6.1Medium

Remedy

Required action (CISA): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. (due: 2026-04-23)

Official 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.

CVSS scores

ScoreVersionSourceVector
6.1Medium 3.1 CISA ADP / Vulnrichment (CISA-ADP) CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

VendorProductVersionsSource
No product information recorded.

References and advisories

4
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Details

Published
2025-06-23
Last updated
2026-04-21
State
Published
Assigner (CNA)
mitre
Kolun priority
69 · High

CISA KEV catalog

Date added
2026-04-20
Due date
2026-04-23
Used in ransomware
Unknown

Exploit prediction (EPSS)

1.71%
Probability of exploitation in 30 days
77.6%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Active
Technical impact
Partial

Weaknesses (CWE)

  • CWE-79
    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')