CVE-2026-48551

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory published 2026-08-12. A secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.4EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.4Exploit: None knownExposed services: Not assessed

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

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
7.4HIGHmedium confidence
EG Risk
33
EG Risk 33/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 12, 2026

Last Modified

September 8, 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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nagios44.4.6-4, 4.4.6-4+deb12u1, 4.4.6-4.1, 4.5.12+ds-1
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nagios44.4.6-4.1, 4.4.6-4.1+deb13u1, 4.5.12+ds-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nagios44.4.6-4.1, 4.5.12+ds-1
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 91× 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.

Showing the most recent 100 of 178 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 22:30 UTCGHSA enrichment
  3. 2026-10-04 08:55 UTCGHSA enrichment
  4. 2026-10-03 19:59 UTCEG score recompute
  5. 2026-10-03 19:59 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-02 22:00 UTCEG score recompute
  8. 2026-10-02 22:00 UTCGHSA enrichment
  9. 2026-10-02 08:21 UTCEG score recompute
  10. 2026-10-02 08:21 UTCGHSA enrichment
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 10:48 UTCGHSA enrichment
  13. 2026-09-30 21:55 UTCEG score recompute
  14. 2026-09-30 21:55 UTCGHSA enrichment
  15. 2026-09-30 15:03 UTCEPSS rescore
  16. 2026-09-29 04:49 UTCEG score recompute
  17. 2026-09-29 04:49 UTCGHSA enrichment
  18. 2026-09-28 14:19 UTCGHSA enrichment
  19. 2026-09-28 01:26 UTCEG score recompute
  20. 2026-09-28 01:26 UTCGHSA enrichment
  21. 2026-09-27 13:48 UTCEPSS rescore
  22. 2026-09-27 09:55 UTCEG score recompute
  23. 2026-09-27 09:55 UTCGHSA enrichment
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-26 00:27 UTCEPSS rescore
Show 75 more
  1. 2026-09-25 03:41 UTCEG score recompute
  2. 2026-09-25 03:41 UTCGHSA enrichment
  3. 2026-09-24 05:34 UTCEG score recompute
  4. 2026-09-24 05:34 UTCGHSA enrichment
  5. 2026-09-23 17:53 UTCEPSS rescore
  6. 2026-09-23 16:42 UTCGHSA enrichment
  7. 2026-09-23 03:49 UTCGHSA enrichment
  8. 2026-09-22 14:57 UTCEG score recompute
  9. 2026-09-22 14:57 UTCGHSA enrichment
  10. 2026-09-22 02:02 UTCEG score recompute
  11. 2026-09-22 02:02 UTCGHSA enrichment
  12. 2026-09-21 13:09 UTCGHSA enrichment
  13. 2026-09-21 00:17 UTCEG score recompute
  14. 2026-09-21 00:17 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 10:15 UTCGHSA enrichment
  17. 2026-09-19 19:45 UTCEG score recompute
  18. 2026-09-19 19:45 UTCGHSA enrichment
  19. 2026-09-19 06:08 UTCEG score recompute
  20. 2026-09-19 06:07 UTCGHSA enrichment
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-18 16:58 UTCGHSA enrichment
  23. 2026-09-18 02:38 UTCEG score recompute
  24. 2026-09-18 02:38 UTCGHSA enrichment
  25. 2026-09-17 13:45 UTCGHSA enrichment
  26. 2026-09-17 00:22 UTCEG score recompute
  27. 2026-09-17 00:22 UTCGHSA enrichment
  28. 2026-09-16 14:08 UTCEPSS rescore
  29. 2026-09-16 05:15 UTCEPSS rescore
  30. 2026-09-16 02:05 UTCGHSA enrichment
  31. 2026-09-15 13:12 UTCEG score recompute
  32. 2026-09-15 13:12 UTCGHSA enrichment
  33. 2026-09-14 21:56 UTCGHSA enrichment
  34. 2026-09-14 08:46 UTCGHSA enrichment
  35. 2026-09-13 19:54 UTCEG score recompute
  36. 2026-09-13 19:54 UTCGHSA enrichment
  37. 2026-09-13 16:47 UTCEPSS rescore
  38. 2026-09-13 07:01 UTCGHSA enrichment
  39. 2026-09-12 18:09 UTCEG score recompute
  40. 2026-09-12 18:09 UTCGHSA enrichment
  41. 2026-09-12 05:17 UTCEG score recompute
  42. 2026-09-12 05:17 UTCGHSA enrichment
  43. 2026-09-11 16:25 UTCEG score recompute
  44. 2026-09-11 16:25 UTCGHSA enrichment
  45. 2026-09-11 14:53 UTCEPSS rescore
  46. 2026-09-11 03:32 UTCGHSA enrichment
  47. 2026-09-10 14:40 UTCEG score recompute
  48. 2026-09-10 14:40 UTCGHSA enrichment
  49. 2026-09-10 09:35 UTCEPSS rescore
  50. 2026-09-10 01:48 UTCGHSA enrichment
  51. 2026-09-09 09:50 UTCEG score recompute
  52. 2026-09-09 09:50 UTCGHSA enrichment
  53. 2026-09-08 22:01 UTCEPSS rescore
  54. 2026-09-08 20:57 UTCEG score recompute
  55. 2026-09-08 20:57 UTCGHSA enrichment
  56. 2026-09-08 07:40 UTCGHSA enrichment
  57. 2026-09-07 18:45 UTCEG score recompute
  58. 2026-09-07 18:45 UTCGHSA enrichment
  59. 2026-09-07 16:01 UTCEPSS rescore
  60. 2026-09-07 05:53 UTCGHSA enrichment
  61. 2026-09-06 16:17 UTCEG score recompute
  62. 2026-09-06 16:17 UTCGHSA enrichment
  63. 2026-09-06 13:47 UTCEPSS rescore
  64. 2026-09-06 03:14 UTCEG score recompute
  65. 2026-09-06 03:14 UTCGHSA enrichment
  66. 2026-09-05 14:22 UTCGHSA enrichment
  67. 2026-09-05 00:43 UTCEG score recompute
  68. 2026-09-05 00:43 UTCGHSA enrichment
  69. 2026-09-04 07:55 UTCEG score recompute
  70. 2026-09-04 07:55 UTCGHSA enrichment
  71. 2026-09-04 05:06 UTCEPSS rescore
  72. 2026-09-03 16:22 UTCGHSA enrichment
  73. 2026-09-02 23:38 UTCEG score recompute
  74. 2026-09-02 23:38 UTCGHSA enrichment
  75. 2026-09-02 14:12 UTCEPSS rescore

Related CVEs(same product + 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 on August 12, 2026, with the most recent update on September 8, 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 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48551?
CVE-2026-48551 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48551?
No fix for CVE-2026-48551 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-48551 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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