Security readout for executives and security teams
Plain-English summary
Nagios XI 5.5.6 has a stored cross-site scripting issue in the user email address field. An authenticated remote user could save malicious script content that later runs in another user's browser when the affected admin page is viewed.
Executive priority
Treat this as a moderate-priority remediation for affected Nagios XI environments, especially because monitoring systems are operationally sensitive and administrator browser sessions may be valuable targets.
Technical view
CVE-2018-15713 is a persistent XSS flaw in Nagios XI 5.5.6, specifically involving the stored email address handled by admin/users.php. The public bundle does not provide CVSS, CWE, fixed-version, or patch details.
Likely exposure
Exposure appears limited to Nagios XI 5.5.6 deployments where remote authenticated users can create or modify stored user email data viewed through the admin users page.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. The attack requires authenticated access and depends on stored content being rendered to another browser session.
Researcher notes
Evidence is narrow: the bundle names Nagios XI 5.5.6, admin/users.php, and stored email address XSS. It does not establish broader version impact, CVSS severity, CWE mapping, active exploitation, or exact fixed build.
Mitigation direction
- Identify any Nagios XI 5.5.6 instances.
- Check Nagios and Tenable guidance for the fixed release or supported remediation.
- Restrict Nagios XI administrative access to trusted users and networks.
- Review user email fields for suspicious script-like content.
- Prioritize remediation where Nagios XI is internet-accessible or broadly administered.
Validation and detection
- Confirm deployed Nagios XI versions against the affected 5.5.6 version.
- Review user records for unexpected markup or script-like email values.
- Verify the admin users page safely renders stored email addresses after remediation.
- Check audit logs for unusual authenticated user-profile changes.
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
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CVE-2018-15713 mapping review
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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.tenable.com/security/research/tra-2018-37CVE reference · x_refsource_MISC
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.