CVE-2021-38156 json
In Nagios XI before 5.8.6, XSS exists in the dashboard page (/dashboards/#) when administrative users attempt to edit a dashboard.
published 2021-09-15 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24626
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 92.9%
- EPSS 92.9% chance of exploitation in 30 days, percentile 99.8%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
In Nagios XI before 5.8.6, XSS exists in the dashboard page (/dashboards/#) when administrative users attempt to edit a dashboard.
Patch / fix
- nagios nagios_xi 5.8.6
Exploit prediction
92.91% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template Nagios XI < 5.8.6 - Cross-Site Scripting nuclei detection template
- raxis.com https://raxis.com/blog/cve-2021-38156 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
raxis.com
/blog/cve-2021-38156
exploit, third-party-advisory
-
nagios.com
/downloads/nagios-xi/change-log/
release-notes, vendor-advisory
Sources
- CVE List CVE-2021-38156
- NVD CVE-2021-38156
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.