What is the CVSS score of EUVD-2025-18891?

EUVD-2025-18891 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Zimbra Collaboration are affected by EUVD-2025-18891?

CVE-2025-48700 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users.

Is there a public PoC exploit available for EUVD-2025-18891?

Yes, a public proof-of-concept exploit is available for EUVD-2025-18891. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate EUVD-2025-18891?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Zimbra Collaboration EUVD-2025-18891

| CVE-2025-48700 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-06-23 cve@mitre.org

XSS Authentication Bypass

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Added to CISA KEV

Apr 20, 2026 - 19:31 CISA

EUVD ID Assigned

Mar 15, 2026 - 22:10 euvd

EUVD-2025-18891

Analysis Generated

Mar 15, 2026 - 22:10 vuln.today

CVE Published

Jun 23, 2025 - 15:15 nvd

MEDIUM 6.1

DescriptionCVE.org

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.

Analysis

EUVD-2025-18891 vulnerability details – vuln.today

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