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 — KEV-added this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • 2,151 internet-exposed hosts are running an affected version right now
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 6%CVSS: 9.8Exploit: cisa kev · ssvc active · public exploitExposed: 2,151

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

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.

Live · internet exposure

2,151 internet-exposed hosts are running an affected version of CVE-2026-19490 right now.

across 37 countries (Germany, Australia, United States, United Kingdom, Mauritius)top: netscaler_gateway
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
6%
EPSS %ILE
93%
KEV
⚠ Exploited

Published

August 19, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 17, 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 61× in last 7d / 261× 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 278 total refreshes for this CVE.

  1. 2026-09-19 19:57 UTCGHSA enrichment
  2. 2026-09-19 16:18 UTCEG score recompute
  3. 2026-09-19 16:18 UTCGHSA enrichment
  4. 2026-09-19 12:39 UTCGHSA enrichment
  5. 2026-09-19 09:00 UTCGHSA enrichment
  6. 2026-09-19 05:22 UTCGHSA enrichment
  7. 2026-09-19 01:43 UTCGHSA enrichment
  8. 2026-09-18 22:05 UTCEG score recompute
  9. 2026-09-18 22:04 UTCGHSA enrichment
  10. 2026-09-18 19:27 UTCEPSS rescore
  11. 2026-09-18 19:20 UTCCISA KEV update
  12. 2026-09-18 18:26 UTCGHSA enrichment
  13. 2026-09-18 14:47 UTCGHSA enrichment
  14. 2026-09-18 14:15 UTCCISA KEV update
  15. 2026-09-18 11:08 UTCGHSA enrichment
  16. 2026-09-18 07:29 UTCGHSA enrichment
  17. 2026-09-18 03:51 UTCGHSA enrichment
  18. 2026-09-18 00:12 UTCGHSA enrichment
  19. 2026-09-17 20:33 UTCEG score recompute
  20. 2026-09-17 20:33 UTCGHSA enrichment
  21. 2026-09-17 16:54 UTCGHSA enrichment
  22. 2026-09-17 12:43 UTCGHSA enrichment
  23. 2026-09-17 09:03 UTCGHSA enrichment
  24. 2026-09-17 05:25 UTCGHSA enrichment
  25. 2026-09-17 01:46 UTCGHSA enrichment
Show 75 more
  1. 2026-09-16 22:08 UTCGHSA enrichment
  2. 2026-09-16 18:29 UTCGHSA enrichment
  3. 2026-09-16 14:51 UTCEG score recompute
  4. 2026-09-16 14:51 UTCGHSA enrichment
  5. 2026-09-16 14:10 UTCCISA KEV update
  6. 2026-09-16 14:07 UTCEPSS rescore
  7. 2026-09-16 11:12 UTCGHSA enrichment
  8. 2026-09-16 07:34 UTCEG score recompute
  9. 2026-09-16 07:34 UTCGHSA enrichment
  10. 2026-09-16 05:14 UTCEPSS rescore
  11. 2026-09-16 03:54 UTCGHSA enrichment
  12. 2026-09-16 00:14 UTCGHSA enrichment
  13. 2026-09-15 20:35 UTCGHSA enrichment
  14. 2026-09-15 16:55 UTCGHSA enrichment
  15. 2026-09-15 13:16 UTCGHSA enrichment
  16. 2026-09-15 09:38 UTCGHSA enrichment
  17. 2026-09-15 05:59 UTCEG score recompute
  18. 2026-09-15 05:59 UTCGHSA enrichment
  19. 2026-09-15 02:20 UTCGHSA enrichment
  20. 2026-09-14 22:42 UTCGHSA enrichment
  21. 2026-09-14 19:24 UTCCISA KEV update
  22. 2026-09-14 19:03 UTCGHSA enrichment
  23. 2026-09-14 15:24 UTCGHSA enrichment
  24. 2026-09-14 11:45 UTCGHSA enrichment
  25. 2026-09-14 08:06 UTCGHSA enrichment
  26. 2026-09-14 04:27 UTCGHSA enrichment
  27. 2026-09-14 00:48 UTCGHSA enrichment
  28. 2026-09-13 21:10 UTCGHSA enrichment
  29. 2026-09-13 17:31 UTCEG score recompute
  30. 2026-09-13 17:31 UTCGHSA enrichment
  31. 2026-09-13 16:46 UTCEPSS rescore
  32. 2026-09-13 13:52 UTCGHSA enrichment
  33. 2026-09-13 10:14 UTCGHSA enrichment
  34. 2026-09-13 06:35 UTCGHSA enrichment
  35. 2026-09-13 02:56 UTCGHSA enrichment
  36. 2026-09-12 23:18 UTCGHSA enrichment
  37. 2026-09-12 19:39 UTCGHSA enrichment
  38. 2026-09-12 16:01 UTCEG score recompute
  39. 2026-09-12 16:01 UTCGHSA enrichment
  40. 2026-09-12 15:00 UTCEPSS rescore
  41. 2026-09-12 12:22 UTCGHSA enrichment
  42. 2026-09-12 08:44 UTCGHSA enrichment
  43. 2026-09-12 05:05 UTCGHSA enrichment
  44. 2026-09-12 01:26 UTCGHSA enrichment
  45. 2026-09-11 21:47 UTCGHSA enrichment
  46. 2026-09-11 18:49 UTCCISA KEV update
  47. 2026-09-11 18:09 UTCEG score recompute
  48. 2026-09-11 18:09 UTCGHSA enrichment
  49. 2026-09-11 14:52 UTCEPSS rescore
  50. 2026-09-11 14:30 UTCGHSA enrichment
  51. 2026-09-11 10:51 UTCEG score recompute
  52. 2026-09-11 10:51 UTCGHSA enrichment
  53. 2026-09-11 09:36 UTCEPSS rescore
  54. 2026-09-11 07:12 UTCGHSA enrichment
  55. 2026-09-11 03:33 UTCGHSA enrichment
  56. 2026-09-10 23:54 UTCGHSA enrichment
  57. 2026-09-10 20:15 UTCGHSA enrichment
  58. 2026-09-10 19:28 UTCCISA KEV update
  59. 2026-09-10 16:36 UTCEG score recompute
  60. 2026-09-10 16:36 UTCGHSA enrichment
  61. 2026-09-10 12:57 UTCEG score recompute▲ 0.50
  62. 2026-09-10 12:57 UTCGHSA enrichment
  63. 2026-09-10 12:56 UTCNVD updateCVSS v3 → 9.8
  64. 2026-09-10 11:52 UTCEG score recompute
  65. 2026-09-10 11:52 UTCGHSA enrichment
  66. 2026-09-10 09:34 UTCEPSS rescore
  67. 2026-09-10 08:13 UTCGHSA enrichment
  68. 2026-09-10 04:34 UTCEG score recompute
  69. 2026-09-10 04:34 UTCGHSA enrichment
  70. 2026-09-10 04:01 UTCEG score recompute
  71. 2026-09-10 04:01 UTCGHSA enrichment
  72. 2026-09-10 03:47 UTCGHSA enrichment
  73. 2026-09-10 00:09 UTCGHSA enrichment
  74. 2026-09-09 20:30 UTCEG score recompute
  75. 2026-09-09 20:29 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 ↗

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 in the National Vulnerability Database 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 patching attention.
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. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-19490?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19490, 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-2026-19490

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