CVE-2026-20306

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. A secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-80884 (ENISA EUVD) · GHSA-m8gm-7wx7-cf56 (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.6%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A vulnerability in the REST API of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted commands to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. In single-node deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
42
EG Risk 42/100

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)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 available. Apply it within your standard update timelines.
EPSS PROB
1.6%
EPSS %ILE
75th
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 (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

September 16, 2026

Last Modified

September 17, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
Patch available.
Web page

Cisco Identity Services Engine Command Injection Vulnerabilities

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-cmd-inj-e2CuZCYZ

Vendor Advisories for CVE-2026-20306(2)

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 14× in last 7d / 61× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 305 rows 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 205 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:51 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  2. 2026-11-13 05:17 UTCEchelonGraph re-scored
  3. 2026-11-13 05:17 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  4. 2026-11-12 16:33 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  5. 2026-11-12 06:45 UTCEchelonGraph re-scored
  6. 2026-11-12 06:45 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  7. 2026-11-11 16:39 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  8. 2026-11-11 08:13 UTCEchelonGraph re-scored
  9. 2026-11-11 08:13 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  10. 2026-11-10 16:42 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  11. 2026-11-10 09:40 UTCEchelonGraph re-scored
  12. 2026-11-10 09:40 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  13. 2026-11-09 16:34 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  14. 2026-11-09 11:08 UTCEchelonGraph re-scored
  15. 2026-11-09 11:08 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  16. 2026-11-08 16:38 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  17. 2026-11-08 12:36 UTCEchelonGraph re-scored
  18. 2026-11-08 12:36 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  19. 2026-11-07 16:38 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  20. 2026-11-07 14:02 UTCEchelonGraph re-scored
  21. 2026-11-07 14:02 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  22. 2026-11-06 16:37 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  23. 2026-11-06 15:30 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  24. 2026-11-05 16:58 UTCEchelonGraph re-scored
  25. 2026-11-05 16:58 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
Show 75 more
  1. 2026-11-05 16:37 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  2. 2026-11-04 18:26 UTCEchelonGraph re-scored
  3. 2026-11-04 18:26 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  4. 2026-11-04 16:35 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  5. 2026-11-03 19:54 UTCEchelonGraph re-scored
  6. 2026-11-03 19:54 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  7. 2026-11-03 16:47 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  8. 2026-11-02 21:22 UTCEchelonGraph re-scored
  9. 2026-11-02 21:22 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  10. 2026-11-02 16:44 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  11. 2026-11-01 22:50 UTCEchelonGraph re-scored
  12. 2026-11-01 22:50 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  13. 2026-11-01 00:18 UTCEchelonGraph re-scored
  14. 2026-11-01 00:18 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  15. 2026-10-31 16:32 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  16. 2026-10-31 01:46 UTCEchelonGraph re-scored
  17. 2026-10-31 01:46 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  18. 2026-10-30 16:34 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  19. 2026-10-30 03:14 UTCEchelonGraph re-scored
  20. 2026-10-30 03:14 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  21. 2026-10-29 16:32 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  22. 2026-10-29 04:43 UTCEchelonGraph re-scored
  23. 2026-10-29 04:42 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  24. 2026-10-28 16:31 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  25. 2026-10-28 06:05 UTCEchelonGraph re-scored
  26. 2026-10-28 06:05 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  27. 2026-10-27 16:31 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  28. 2026-10-27 07:33 UTCEchelonGraph re-scored
  29. 2026-10-27 07:33 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  30. 2026-10-26 16:31 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  31. 2026-10-26 06:18 UTCEchelonGraph re-scored
  32. 2026-10-26 06:18 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  33. 2026-10-25 16:32 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  34. 2026-10-25 14:44 UTCEchelonGraph re-scored
  35. 2026-10-25 07:47 UTCEchelonGraph re-scored
  36. 2026-10-25 07:47 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  37. 2026-10-24 16:32 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  38. 2026-10-24 09:15 UTCEchelonGraph re-scored
  39. 2026-10-24 09:14 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  40. 2026-10-23 16:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  41. 2026-10-23 10:41 UTCEchelonGraph re-scored
  42. 2026-10-23 10:41 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  43. 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  44. 2026-10-22 11:59 UTCEchelonGraph re-scored
  45. 2026-10-22 11:59 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  46. 2026-10-21 16:32 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  47. 2026-10-21 13:25 UTCEchelonGraph re-scored
  48. 2026-10-21 13:25 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  49. 2026-10-20 16:32 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  50. 2026-10-20 14:50 UTCEchelonGraph re-scored
  51. 2026-10-20 14:50 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  52. 2026-10-19 16:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  53. 2026-10-19 14:15 UTCEchelonGraph re-scored
  54. 2026-10-19 14:15 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  55. 2026-10-18 16:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  56. 2026-10-18 15:43 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  57. 2026-10-18 03:57 UTCEchelonGraph re-scored
  58. 2026-10-17 17:10 UTCEchelonGraph re-scored
  59. 2026-10-17 17:10 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  60. 2026-10-17 16:33 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  61. 2026-10-16 18:36 UTCEchelonGraph re-scored
  62. 2026-10-16 18:36 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  63. 2026-10-16 16:41 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  64. 2026-10-16 07:56 UTCEchelonGraph re-scored
  65. 2026-10-16 07:56 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  66. 2026-10-15 16:31 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  67. 2026-10-15 06:57 UTCEchelonGraph re-scored
  68. 2026-10-15 06:57 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  69. 2026-10-14 16:32 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  70. 2026-10-14 02:46 UTCEchelonGraph re-scored
  71. 2026-10-14 02:45 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  72. 2026-10-13 16:33 UTCEPSS rescoreEPSS 1.4% · 71st percentile
  73. 2026-10-12 22:53 UTCEchelonGraph re-scored
  74. 2026-10-12 22:52 UTCGHSA enrichmentGHSA-m8gm-7wx7-cf56 · GitHub severity CRITICAL · GitHub CVSS 9.1
  75. 2026-10-12 16:33 UTCEPSS rescoreEPSS 1.4% · 71st percentile

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Frequently asked(5)

What is CVE-2026-20306?
CVE-2026-20306 is a critical-severity vulnerability; its CVE record was published on September 16, 2026. A vulnerability in the REST API of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials. This…
When was the CVE record for CVE-2026-20306 published?
The CVE record for CVE-2026-20306 was published on September 16, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 17, 2026; the record at its source may have been updated since.
Is CVE-2026-20306 actively exploited?
CVE-2026-20306 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.6% probability of exploitation in the next 30 days (75th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-20306?
CVE-2026-20306 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-20306?
A fix for CVE-2026-20306 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-20306 are linked in the Vendor Advisories panel on this page.

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