CVE-2025-27828Network attack vector

Reflected script execution via insufficient input validation

Published Jun 24, 2025 · Updated Jun 24, 2025

Reflected XSS in Mitel MiContact Center Business 10.2.0.4 and earlier allows remote attackers to execute scripts through Legacy Chat. The Legacy Chat component returns attacker-controlled input to a browser without sufficient validation, but Mitel has not disclosed the affected parameter or code path. Exploitation requires a user to interact with crafted content and permits limited access to sensitive information and modification of the current chat.

CVSS severity7.1
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reflected XSS in Mitel MiContact Center Business 10.2.0.4 and earlier allows remote attackers to execute scripts through Legacy Chat. The Legacy Chat component returns attacker-controlled input to a browser without sufficient validation, but Mitel has not disclosed the affected parameter or code path. Exploitation requires a user to interact with crafted content and permits limited access to sensitive information and modification of the current chat.

The record

CVE
CVE-2025-27828
Published
Jun 24, 2025
Updated
Jun 24, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1MitelCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo