CVE-2025-27827
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability in the legacy chat component of Mitel MiContact Center Business through 10.2.0.3 could allow an unauthenticated attacker to conduct an information disclosure attack due to improper handling of session data. A successful exploit requires user interaction and could allow an attacker to access sensitive information, leading to unauthorized access to active chat rooms, reading chat data, and sending messages during an active chat session.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA high-severity information disclosure vulnerability in Mitel MiContact Center Business legacy chat component (versions through 10.2.0.3) allows unauthenticated attackers to access active chat rooms, read chat data, and send messages by exploiting improper session data handling. User interaction is required for exploitation.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if Mitel MiContact Center Business is installedCheck for the application in standard installation directories (Windows: Program Files\Mitel\MiContact Center Business or similar; Linux: /opt/mitel/ or /usr/local/mitel/) or check running services for MiContact Center processesAffected if MiContact Center Business software is present on the system
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Determine the installed version of MiContact Center BusinessCheck the application's version through its admin interface, check installed program information (Windows Add/Remove Programs or Linux package manager), or examine version files in the installation directory. Compare the version to 10.2.0.3Affected if The installed version is 10.2.0.3 or any earlier version (e.g., 10.2.0.2, 10.2.0.1, 10.1.x, etc.)
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Verify if the legacy chat component is enabledCheck the MiContact Center Business admin panel configuration for the legacy chat component status, or examine configuration files in the installation directory for chat-related settings (look for terms like 'legacy chat', 'chat module', or 'chat service')Affected if The legacy chat component is actively enabled or configured in the system
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Inspect session handling configuration for the chat moduleExamine the configuration files or admin settings related to session management in the legacy chat component. Look for session timeout settings, session token configuration, or session persistence settingsAffected if Session management is configured to use the legacy handler without proper session isolation or token validation settings
The environment is affected if MiContact Center Business version 10.2.0.3 or earlier is installed AND the legacy chat component is enabled, as the vulnerability requires both conditions to be present for exploitation.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade to the vendor-provided patched version of MiContact Center Business and review session management implementations in the legacy chat component.
- Consultation6.0 h
- Implementation12.0 h
- Testing10.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,928.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27827 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-27827 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data