What is the CVSS score of CVE-2026-4108?

CVE-2026-4108 has a CVSS 3.1 base score of 7.3 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of Microsoft are affected by CVE-2026-4108?

Zoho ManageEngine Exchange Reporter Plus contains a stored cross-site scripting vulnerability affecting versions before 5802 that allows authenticated users to inject malicious scripts through…. A patch is available.

How to fix or mitigate CVE-2026-4108?

Within 24 hours: Inventory all ManageEngine Exchange Reporter Plus deployments and identify current versions. Within 7 days: Apply vendor patch to version 5802 or later across all affected instances; test in non-production environment first. Within 30 days: Conduct access review of authenticated accounts with report modification privileges and review audit logs for suspicious script injection attempts in the Non-Owner Mailbox Permission report functionality.

Microsoft CVE-2026-4108

EUVD-2026-18627 HIGH

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

2026-04-03 Zohocorp

GHSA-hmvm-5r4j-5wx3

XSS Microsoft

7.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.3 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 06:07 EUVD-patch-fix

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

5802

EUVD ID Assigned

Apr 03, 2026 - 12:15 euvd

EUVD-2026-18627

Analysis Generated

Apr 03, 2026 - 12:15 vuln.today

CVE Published

Apr 03, 2026 - 11:47 nvd

HIGH 7.3

DescriptionCVE.org

Zohocorp ManageEngine Exchange Reporter Plus versions before 5802 are vulnerable to Stored XSS in Non-Owner Mailbox Permission report.

AnalysisAI

Stored cross-site scripting (XSS) in Zohocorp ManageEngine Exchange Reporter Plus versions prior to 5802 allows authenticated attackers to inject malicious scripts through the Non-Owner Mailbox Permission report, potentially compromising confidentiality and integrity of user sessions. With CVSS 7.3 (High) and EPSS data unavailable, exploitation requires low attack complexity and authenticated access with user interaction. No public exploit identified at time of analysis, and vendor has released patched version 5802.

Technical ContextAI

This vulnerability stems from inadequate input validation and output encoding (CWE-79: Improper Neutralization of Input During Web Page Generation) within the Non-Owner Mailbox Permission reporting module of ManageEngine Exchange Reporter Plus. The affected product (cpe:2.3:a:zohocorp:manageengine_exchange_reporter_plus) is an enterprise reporting and auditing solution for Microsoft Exchange environments, designed to track mailbox permissions, access patterns, and administrative activities. Stored XSS vulnerabilities occur when untrusted data is persisted in the application (typically a database) and later rendered in web pages without proper sanitization. In this context, the Non-Owner Mailbox Permission report likely displays mailbox delegation data sourced from Exchange servers, and attackers with authenticated access can inject JavaScript payloads into report parameters or data fields that persist and execute when other users view the compromised report.

RemediationAI

Upgrade ManageEngine Exchange Reporter Plus to build 5802 or later, which contains fixes for the stored XSS vulnerability per the vendor security advisory at https://www.manageengine.com/products/exchange-reports/advisory/CVE-2026-4108.html. Administrator should download the latest version from the ManageEngine product portal and follow standard upgrade procedures, ensuring backups of configuration and report data before applying the patch. As an interim control while scheduling upgrades, restrict access to the Exchange Reporter Plus web interface to trusted administrator IP ranges using firewall rules or web application firewall policies, and educate users with report access about the risks of clicking unexpected links or interacting with anomalous report content. Review audit logs for suspicious report modifications or unusual authentication patterns that might indicate reconnaissance or exploitation attempts. No workarounds exist to fully mitigate stored XSS without patching, as the vulnerability resides in the core report rendering logic.