Security readout for executives and security teams
Plain-English summary
CVE-2019-20139 is an authenticated cross-site scripting issue in Nagios XI 5.6.9. A logged-in user could submit crafted values that execute script in another user’s browser, including an administrator. Business risk is highest where many users access Nagios XI or where admins use the same browser session for privileged work.
Executive priority
Treat as a near-term remediation item for Nagios XI environments, especially shared or multi-user deployments. It is not KEV-listed in the bundle, but administrator-targeted XSS in monitoring software can create meaningful operational risk.
Technical view
The CVE describes XSS in nocscreenapi.php parameters host, hostgroup, or servicegroup, and schedulereport.php parameters hour or frequency. The stated attacker is any authenticated user, with the admin user as a target. The bundle provides no CVSS score, CWE, confirmed fixed version, or vendor mitigation details.
Likely exposure
Exposure appears limited to Nagios XI 5.6.9 based on the CVE description. The affected product metadata in the bundle is incomplete, so teams should verify exact Nagios XI versions and whether these endpoints exist in their deployment.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires authenticated access, but impact could rise if a low-privileged user can target an administrator’s browser session inside a monitoring environment.
Researcher notes
Evidence is sparse: one CVE description and one public blog reference. No CVSS vector, CWE mapping, affected-version range, or fixed release is included. Avoid assuming broader Nagios versions without vendor confirmation.
Mitigation direction
- Check Nagios vendor guidance for fixed versions or official mitigation.
- Restrict Nagios XI access to trusted users and networks.
- Remove or disable unneeded authenticated accounts.
- Reduce administrator browsing exposure in Nagios XI until remediated.
- Review role assignments for least-privilege access.
Validation and detection
- Inventory Nagios XI deployments and confirm version 5.6.9 exposure.
- Confirm whether nocscreenapi.php and schedulereport.php are reachable.
- Review logs for unusual requests to the named endpoints.
- Check whether authenticated non-admin users can access affected workflows.
- Verify any vendor fix in staging before production rollout.
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-2019-20139 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://code610.blogspot.com/2019/12/multiple-xss-bugs-in-nagios-569.htmlCVE 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.