# CVE-2026-27655: Zohocorp ManageEngine Exchange Reporter Plus stored XSS in mailbox reports

Source: https://junglewise.ai/threats/cve-2026-27655-zohocorp-manageengine-exchange-reporter-plus-stored-xss-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-03. Updated: 2026-07-20  
License: CC BY 4.0 with a link back

CVE-2026-27655 · Severity: high · CVSS 7.3 · Published 2026-04-03

ManageEngine Exchange Reporter Plus, a tool used for monitoring and reporting on Microsoft Exchange environments, is vulnerable to a security flaw in its mailbox permissions reporting module. An attacker with existing administrative access to the Exchange environment could inject malicious scripts that execute when other users view specific reports. This could allow the attacker to hijack user sessions or perform unauthorized actions within the reporting software.

Technologies: [Zoho Corporation Exchange Reporter Plus](https://junglewise.ai/threats/technologies/exchange-reporter-plus). Vendors: [Zoho Corporation](https://junglewise.ai/threats/vendors/zoho-corporation).

## Quick answers

**Is CVE-2026-27655 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-27655 being exploited in the wild.

**How severe is CVE-2026-27655?** High severity, with a CVSS score of 7.3, published 3 April 2026.

**Which products and versions are affected?** Zoho Corporation Exchange Reporter Plus Builds 5801 and below.

**Is there a fix for CVE-2026-27655?** A patch was published on 2026-03-19: Fixed in version 5802 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-27655 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-27655?** Check whether you run Zoho Corporation Exchange Reporter Plus at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stored cross-site scripting (XSS) vulnerability exists in ManageEngine Exchange Reporter Plus builds 5801 and below. The flaw is located within the 'Permissions Based on Mailboxes' report in the Reports module due to improper input validation. An authenticated attacker with Exchange administrative privileges can inject malicious scripts into mailbox metadata that the application later renders without sufficient sanitization. When a victim views the affected report, the script executes in their browser context, potentially allowing the attacker to perform actions with the victim's privileges. The issue is resolved in version 5802.

## Affected products

- Zohocorp ManageEngine Exchange Reporter Plus Builds 5801 and below

## Timeline

- 2026-03-19: patched: Fixed in version 5802
- 2026-04-03: advisory: Initial NVD publication and vendor advisory release

## References

- [https://www.manageengine.com/products/exchange-reports/advisory/CVE-2026-27655.html](https://www.manageengine.com/products/exchange-reports/advisory/CVE-2026-27655.html)

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