CVE-2026-19490

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-09-09), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • 3,519 internet-facing services (distinct ip:port) on record running an affected version — derived from Shodan data (© Shodan); a patched service can stay counted while its port stays open
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 23%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed services: 3,519

A fix is available — apply it.

Vulnerability in NetScaler ADC and NetScaler Gateway.

This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.

Internet exposure · derived from Shodan data

3,519 internet-facing services (distinct ip:port) on record running a version that maps to CVE-2026-19490, in our KEV-Exposure radar’s Shodan-derived sample.

across 46 countries (Germany, Australia, United States, Mauritius, United Kingdom)top: netscaler_gateway
See the KEV-Exposure radar →Derived from Shodan data. Shodan data is owned by Shodan, which holds its copyright (© Shodan). EchelonGraph claims no ownership of it or copyright in it. Aggregate, host-redacted.

How it counts: every 12 hours, when Shodan query credits allow, the radar runs one Shodan query per tracked product, reads up to 100 ip:port services per query, and keeps a service when its banner version matches a CISA-KEV or high-EPSS CVE; a service is dropped when neither a search nor a Shodan InternetDB port re-check has refreshed it for 21 days. A re-check that finds the port still listed by Shodan InternetDB refreshes the service without re-reading the banner, so a patched service can stay counted while its port stays open. A count is a banner-version inference over a sample, not an exploit test and not an internet-wide census, and the unit is a service, not a machine: a machine answering on two ports counts twice.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100CISA 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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
23%
EPSS %ILE
97th
KEV
⚠ Exploited

CISA SSVCAttend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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 19, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Oct 1, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-19490
generic

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https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696939

Vendor Advisories for CVE-2026-19490(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 57× in last 7d / 263× 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 407 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCTarPeg007/CVE-2026-19490
    First seen Sep 2, 2026

    NetScaler ADC/Gateway SAML unsigned-assertion bypass via HTTP-Redirect binding (CTX696939) - root cause analysis + PoC

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-19490?
CVE-2026-19490 is a critical vulnerability published on August 19, 2026. Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.
When was CVE-2026-19490 disclosed?
CVE-2026-19490 was first published on August 19, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19490 actively exploited?
Yes. CISA added CVE-2026-19490 to the Known Exploited Vulnerabilities catalog on September 9, 2026, affecting Citrix NetScaler. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2026-19490?
CVE-2026-19490 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2026-19490?
CVE-2026-19490 affects Citrix NetScaler.
How do I remediate CVE-2026-19490?
A fix for CVE-2026-19490 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-19490 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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