CVE-2026-48551

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory published 2026-08-12. the CNA's CVSS baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: 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 contain a cross-site request forgery protection bypass via a self-supplied double-submit cookie. An attacker can supply matching cookie and request parameter values to bypass CSRF protection, enabling unauthenticated attackers to run commands as authorized users via malicious links.

CVSS v3
7.4
EG Score
7.4(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
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 CSRF Protection Bypass via Double-Submit Cookie | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nagios-core-xi-csrf-protection-bypass-via-double-submit-cookie
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-2026-48551(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 26× in last 7d / 38× 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 03:43 UTCEG score recompute
  2. 2026-08-21 03:43 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 14:50 UTCGHSA enrichment
  5. 2026-08-20 01:57 UTCEG score recompute
  6. 2026-08-20 01:57 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 13:04 UTCGHSA enrichment
  9. 2026-08-19 00:10 UTCGHSA enrichment
  10. 2026-08-18 11:18 UTCGHSA enrichment
  11. 2026-08-17 22:26 UTCEG score recompute
  12. 2026-08-17 22:26 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 09:29 UTCGHSA enrichment
  15. 2026-08-16 20:37 UTCEG score recompute
  16. 2026-08-16 20:37 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 07:44 UTCEG score recompute
  19. 2026-08-16 07:44 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 18:53 UTCGHSA enrichment
  22. 2026-08-15 06:01 UTCEG score recompute
  23. 2026-08-15 06:01 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 17:09 UTCEG score recompute
Show 13 more
  1. 2026-08-14 17:09 UTCGHSA enrichment
  2. 2026-08-14 06:10 UTCEG score recompute
  3. 2026-08-14 06:10 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 17:18 UTCEG score recompute
  6. 2026-08-13 17:18 UTCGHSA enrichment
  7. 2026-08-13 16:37 UTCEG score recompute
  8. 2026-08-13 16:37 UTCGHSA enrichment
  9. 2026-08-13 06:28 UTCEG score recompute
  10. 2026-08-13 06:28 UTCGHSA enrichment
  11. 2026-08-12 17:35 UTCEG score recompute
  12. 2026-08-12 16:41 UTCEG score recompute
  13. 2026-08-12 16:40 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48551?
CVE-2026-48551 is a high vulnerability published on August 12, 2026. Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 contain a cross-site request forgery protection bypass via a self-supplied double-submit cookie. An attacker can supply matching cookie and request parameter values to bypass CSRF protection, enabling unauthenticated attackers to run commands…
When was CVE-2026-48551 disclosed?
CVE-2026-48551 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-2026-48551 actively exploited?
CVE-2026-48551 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 92.9% of all scored CVEs.
What is the CVSS score of CVE-2026-48551?
CVE-2026-48551 has a CVSS v4.0 base score of 7.4 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-48551?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48551, 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-2026-48551

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