CVE-2026-48550

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-08-12. the CNA's CVSS baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to reflected cross-site scripting in cmd.cgi via the NagFormId parameter. An unauthenticated remote attacker can craft a malicious link that, when followed by an authenticated user, executes arbitrary JavaScript in the victim's browser.

CVSS v3
6.1
EG Score
6.1(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

August 12, 2026

Last Modified

August 14, 2026

Advisory Details (3)

Auto-updated Aug 12, 2026
No patch confirmed yet.
generic

Nagios Core / XI cmd.cgi Reflected XSS via NagFormId Parameter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nagios-core-xi-cmd-cgi-reflected-xss-via-nagformid-parameter
generic

nagioscore/Changelog at master · NagiosEnterprises/nagioscore · GitHub

https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
generic

Nagios Core Security Disclosures | Nagios Enterprises

https://www.nagios.com/security-disclosures/nagios-core/

Vendor Advisories for CVE-2026-48550(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 25× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 05:19 UTCEG score recompute
  2. 2026-08-21 05:19 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 07:00 UTCEG score recompute
  5. 2026-08-20 07:00 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 08:42 UTCEG score recompute
  8. 2026-08-19 08:42 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 10:24 UTCEG score recompute
  11. 2026-08-18 10:24 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 12:05 UTCEG score recompute
  14. 2026-08-17 12:05 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 13:46 UTCEG score recompute
  17. 2026-08-16 13:46 UTCGHSA enrichment
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 15:28 UTCEG score recompute
  20. 2026-08-15 15:28 UTCGHSA enrichment
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 17:09 UTCEG score recompute
  23. 2026-08-14 17:09 UTCGHSA enrichment
  24. 2026-08-14 15:57 UTCEG score recompute
  25. 2026-08-14 15:57 UTCGHSA enrichment
Show 8 more
  1. 2026-08-13 22:00 UTCEPSS rescore
  2. 2026-08-13 17:38 UTCGHSA enrichment
  3. 2026-08-12 19:19 UTCEG score recompute
  4. 2026-08-12 19:19 UTCGHSA enrichment
  5. 2026-08-12 18:31 UTCEG score recompute
  6. 2026-08-12 17:35 UTCEG score recompute
  7. 2026-08-12 16:41 UTCEG score recompute
  8. 2026-08-12 16:40 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48550?
CVE-2026-48550 is a medium vulnerability published on August 12, 2026. Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to reflected cross-site scripting in cmd.cgi via the NagFormId parameter. An unauthenticated remote attacker can craft a malicious link that, when followed by an authenticated user, executes arbitrary JavaScript in the victim's…
When was CVE-2026-48550 disclosed?
CVE-2026-48550 was first published in the National Vulnerability Database on August 12, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48550 actively exploited?
CVE-2026-48550 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.4% of all scored CVEs.
What is the CVSS score of CVE-2026-48550?
CVE-2026-48550 has a CVSS v4.0 base score of 6.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-48550?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48550, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-48550

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