CVE-2026-48549

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 6.5 from GitHub Security Advisory published 2026-08-26. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi. When no Cookie header is present, the double-submit cookie protection can be bypassed by supplying matching NagFormId and nagFormId values in the POST body, allowing a cross-site request to execute Nagios commands as a currently authenticated user.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-22). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 26, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Aug 26, 2026
Fix referenced — no release confirmed yet.
Web page

Nagios Core / XI CSRF via cmd.cgi Double-Submit Cookie | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nagios-core-xi-csrf-via-cmd-cgi-double-submit-cookie
Web page

nagioscore/Changelog at master · NagiosEnterprises/nagioscore · GitHub

https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
Web page

Nagios Core Security Disclosures | Nagios Enterprises

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

Vendor Advisories for CVE-2026-48549(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 10× in last 7d / 66× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 145 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 45 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  2. 2026-10-22 23:05 UTCEG score recompute
  3. 2026-10-22 23:05 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  4. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  5. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  6. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  7. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  8. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  9. 2026-10-18 03:34 UTCEG score recompute
  10. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  11. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  12. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  13. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  14. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  16. 2026-10-12 16:00 UTCEG score recompute
  17. 2026-10-11 19:44 UTCEG score recompute
  18. 2026-10-11 16:58 UTCEG score recompute
  19. 2026-10-11 14:22 UTCEG score recompute
  20. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  21. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  22. 2026-10-10 06:08 UTCEG score recompute
  23. 2026-10-10 06:08 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  24. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  25. 2026-10-09 03:22 UTCEG score recompute
Show 75 more
  1. 2026-10-09 03:22 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  2. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  3. 2026-10-08 01:51 UTCEG score recompute
  4. 2026-10-08 01:51 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  5. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  6. 2026-10-07 00:04 UTCEG score recompute
  7. 2026-10-07 00:04 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  8. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  9. 2026-10-06 01:41 UTCEG score recompute
  10. 2026-10-06 01:41 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  11. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  12. 2026-10-05 01:24 UTCEG score recompute
  13. 2026-10-05 01:24 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  15. 2026-10-04 01:58 UTCEG score recompute
  16. 2026-10-04 01:58 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  18. 2026-10-03 02:04 UTCEG score recompute
  19. 2026-10-03 02:04 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  20. 2026-10-02 03:39 UTCEG score recompute
  21. 2026-10-02 03:39 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  23. 2026-10-01 04:27 UTCEG score recompute
  24. 2026-10-01 04:27 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  26. 2026-09-30 06:04 UTCEG score recompute
  27. 2026-09-30 06:04 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  28. 2026-09-28 21:20 UTCEG score recompute
  29. 2026-09-28 21:20 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  30. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  31. 2026-09-27 18:58 UTCEG score recompute
  32. 2026-09-27 18:58 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  33. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  34. 2026-09-26 20:35 UTCEG score recompute
  35. 2026-09-26 20:35 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  36. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  37. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.3% · 15th percentile
  38. 2026-09-24 21:14 UTCEG score recompute
  39. 2026-09-24 21:14 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  40. 2026-09-24 03:08 UTCEG score recompute
  41. 2026-09-24 03:08 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  42. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  43. 2026-09-23 04:44 UTCEG score recompute
  44. 2026-09-23 04:44 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  45. 2026-09-22 06:20 UTCEG score recompute
  46. 2026-09-22 06:20 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  47. 2026-09-21 07:55 UTCEG score recompute
  48. 2026-09-21 07:55 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  49. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  50. 2026-09-20 09:32 UTCEG score recompute
  51. 2026-09-20 09:32 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  52. 2026-09-19 11:08 UTCEG score recompute
  53. 2026-09-19 11:08 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  54. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  55. 2026-09-18 12:45 UTCEG score recompute
  56. 2026-09-18 12:45 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  57. 2026-09-17 14:21 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  58. 2026-09-16 15:42 UTCEG score recompute
  59. 2026-09-16 15:42 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  60. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  61. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  62. 2026-09-15 17:18 UTCEG score recompute
  63. 2026-09-15 17:18 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  64. 2026-09-14 18:54 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  65. 2026-09-13 20:09 UTCEG score recompute
  66. 2026-09-13 20:09 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  67. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  68. 2026-09-12 21:45 UTCEG score recompute
  69. 2026-09-12 21:45 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  70. 2026-09-11 23:21 UTCEG score recompute
  71. 2026-09-11 23:21 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  72. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  73. 2026-09-11 00:28 UTCEG score recompute
  74. 2026-09-11 00:28 UTCGHSA enrichmentGHSA-xm5q-p2r5-r5wj · GitHub CVSS 6.5
  75. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 6th percentile

Frequently asked(5)

What is CVE-2026-48549?
CVE-2026-48549 is a medium-severity vulnerability; its CVE record was published on August 26, 2026. Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 contains a CSRF vulnerability in cmd.cgi. When no Cookie header is present, the double-submit cookie protection can be bypassed by supplying matching NagFormId and nagFormId values in the POST body, allowing a cross-site request to execute…
When was CVE-2026-48549 made public?
CVE-2026-48549 was made public on May 28, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 26, 2026. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-48549 actively exploited?
CVE-2026-48549 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-2026-48549?
CVE-2026-48549 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48549?
A fix for CVE-2026-48549 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-48549 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-48549

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Is Your Infrastructure Affected by CVE-2026-48549?

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