Security readout for executives and security teams
Plain-English summary
This issue affects older Mitel conferencing sign-in pages. An unauthenticated attacker could trick a user into opening a crafted link that runs script in that user's browser. Business impact depends on who uses the conferencing portal and what their browser session can access.
Executive priority
Treat this as a targeted cleanup item for legacy Mitel conferencing systems, not a confirmed emergency. Prioritize internet-facing or broadly used portals because successful XSS can affect user trust and session safety.
Technical view
CVE-2018-9103 is a reflected XSS vulnerability in the Mitel MiVoice Connect conferencing component signin.php page. The source bundle attributes it to insufficient validation. Affected versions are MiVoice Connect R1707-PREM SP1 21.84.5535.0 and earlier, and Mitel ST 14.2 GA27 19.49.5200.0 and earlier.
Likely exposure
Exposure is most likely in organizations still running the named Mitel MiVoice Connect or Mitel ST versions, especially where the conferencing sign-in page is reachable by users or the internet.
Exploitation context
The bundle says exploitation is unauthenticated and reflected XSS. It does not provide CVSS, public exploit evidence, or CISA KEV status. There is no source-bundle evidence of active exploitation.
Researcher notes
The public bundle is narrow: affected products, version boundaries, vulnerable page, unauthenticated reflected XSS, and arbitrary script execution are stated. CVSS, CWE, patch details, and exploit-in-the-wild evidence are absent from the provided data.
Mitigation direction
- Check Mitel advisory 18-0003 and bulletin 18-0003-001 for vendor remediation guidance.
- Inventory Mitel MiVoice Connect and Mitel ST deployments and versions.
- Prioritize affected conferencing portals reachable from untrusted networks.
- Reduce unnecessary external access to the conferencing sign-in page where operationally feasible.
- Apply vendor-supported updates or configuration changes only as documented by Mitel.
Validation and detection
- Confirm whether MiVoice Connect R1707-PREM SP1 21.84.5535.0 or earlier is present.
- Confirm whether Mitel ST 14.2 GA27 19.49.5200.0 or earlier is present.
- Identify exposed conferencing signin.php pages without attempting exploit payloads.
- Review access logs for unusual or repeated signin.php requests.
- Document whether vendor guidance has been applied to each affected system.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-9103 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.mitel.com/mitel-product-security-advisory-18-0003CVE reference · x_refsource_CONFIRM
- https://www.mitel.com/sites/default/files/2018-Security-Bulletin-18-0003-001.pdfCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.