CVE-2026-48554

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-12. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: 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 authenticated remote code execution via unfiltered NOTIFICATION-family macro substitution through the com_data parameter. When a notification command references $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ in a shell-reachable position, authenticated UI users can run arbitrary commands as the nagios user. Exploitation requires a non-default configuration in which a notification command references these macros in a shell-executed command line.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
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 Authenticated RCE via Unfiltered NOTIFICATION-Family Macro Substitution | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nagios-core-xi-authenticated-rce-via-unfiltered-notification-family-macro-substitution
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-2026-48554(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 30× in last 7d / 39× 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 00:41 UTCEG score recompute
  2. 2026-08-21 00:41 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 12:05 UTCGHSA enrichment
  5. 2026-08-19 23:18 UTCEG score recompute
  6. 2026-08-19 23:18 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 10:41 UTCGHSA enrichment
  9. 2026-08-18 21:58 UTCEG score recompute
  10. 2026-08-18 21:58 UTCGHSA enrichment
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-18 09:19 UTCGHSA enrichment
  13. 2026-08-17 20:44 UTCEG score recompute
  14. 2026-08-17 20:44 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 08:07 UTCGHSA enrichment
  17. 2026-08-16 19:32 UTCEG score recompute
  18. 2026-08-16 19:32 UTCGHSA enrichment
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 06:56 UTCEG score recompute
  21. 2026-08-16 06:56 UTCGHSA enrichment
  22. 2026-08-16 02:14 UTCEPSS rescore
  23. 2026-08-15 18:21 UTCGHSA enrichment
  24. 2026-08-15 05:45 UTCEG score recompute
  25. 2026-08-15 05:45 UTCGHSA enrichment
Show 14 more
  1. 2026-08-15 01:30 UTCEPSS rescore
  2. 2026-08-14 17:09 UTCEG score recompute
  3. 2026-08-14 17:09 UTCGHSA enrichment
  4. 2026-08-14 08:08 UTCEG score recompute
  5. 2026-08-14 08:08 UTCGHSA enrichment
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 19:32 UTCGHSA enrichment
  8. 2026-08-13 06:56 UTCEG score recompute
  9. 2026-08-13 06:56 UTCGHSA enrichment
  10. 2026-08-12 18:19 UTCEG score recompute
  11. 2026-08-12 18:11 UTCEG score recompute
  12. 2026-08-12 17:35 UTCEG score recompute
  13. 2026-08-12 17:06 UTCEG score recompute
  14. 2026-08-12 17:05 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48554?
CVE-2026-48554 is a high vulnerability published on August 12, 2026. Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to authenticated remote code execution via unfiltered NOTIFICATION-family macro substitution through the com_data parameter. When a notification command references $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ in a…
When was CVE-2026-48554 disclosed?
CVE-2026-48554 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-2026-48554 actively exploited?
CVE-2026-48554 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.7% of all scored CVEs.
What is the CVSS score of CVE-2026-48554?
CVE-2026-48554 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-48554?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48554, 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

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