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CVE-2026-88771

CVE-2026-88771

validatedZero produced an exploit or a check.

EUVD-2026-87958 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).+2h14mkevAttacks confirmed in the real world.+5h28m
Citrix NetScaler < 14.1-73.37; < 13.1-64.23; >= 0, < 14.1-73.37 FIPS; >= 0, < 13.1.37.279 FIPS and NDcPP
fixed in 14.1-73.37, 13.1-64.23, 14.1-73.37 FIPS, 13.1.37.279 FIPS and NDcPP
CWE-20 Improper Input Validation
ETK-2026-7, permanent identifier
cvss9.8nvdCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
+4.4dTTV
8mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
trigger signal +0dcve.org publication+0.7dpublic poc+0.8dkev+0.9dcheck available+5.0dagent stopped
0
+2d
+3d
+4d

description

Citrix NetScaler ADC and Gateway releases before the listed fixed versions are affected by improper input validation. An unauthenticated attacker may be able to execute arbitrary commands against a vulnerable appliance. Exposure requires a reachable vulnerable ADC or Gateway instance.

mitigation

Upgrade ADC to 14.1-73.37, 13.1-64.23, 14.1-73.37 FIPS, or 13.1.37.279 FIPS and NDcPP, as applicable. Upgrade Gateway to 14.1-73.37 or 13.1-64.23.

fixed in 14.1-73.37, 13.1-64.23, 14.1-73.37 FIPS, 13.1.37.279 FIPS and NDcPP

check
available
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
1.1%64th percentile
agent run time
8m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-27 16:02Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
+2h14m
Δ to kevAttacks confirmed in the real world.
+5h28m

outcome

Contextual check: a technique exists and was validated, but no deterministic check could cover this one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-09-27
  2. 2026-09-27 00:00Z
  3. 2026-09-27 00:00Z
  4. 2026-09-27 00:00Z
  5. 2026-09-27 16:02Z
  6. 2026-09-29 20:11Z
  7. 2026-10-01 04:35Z
    Citrix NetScaler Post-Exploitation Payload Creates Superuser, Maps Web Shell to CSS-Like URLs
    thehackernews · https://thehackernews.com/2026/10/citrix-netscaler-post-exploitation.html
  8. 2026-10-02 00:27Z
    Attackers Exploit NetScaler Flaw for Root Access, Deploy WHIPSHOT and SLAPSHOT
    thehackernews · https://thehackernews.com/2026/09/attackers-exploit-netscaler-flaw-for.html
  9. 2026-10-02 00:27Z
    Citrix NetScaler CVE-2026-88772 Exploit Details Show Pre-Auth Path to Shellcode Execution
    thehackernews · https://thehackernews.com/2026/09/citrix-netscaler-cve-2026-88772-exploit.html
  10. 2026-10-02 00:27Z
    CISA Says Attackers Are Exploiting Two Critical Citrix NetScaler Flaws Globally
    thehackernews · https://thehackernews.com/2026/09/cisa-says-attackers-are-exploiting-two.html
  11. 2026-10-02 00:27Z
    Warning: Two Unpatched Citrix NetScaler RCE Zero-Days Under Active Exploitation
    thehackernews · https://thehackernews.com/2026/09/warning-two-unpatched-citrix-netscaler.html
  12. 2026-10-02 05:49Z
    Critical FortiMail Zero-Day Flaw Exploited in Attacks Allows Unauthenticated Arbitrary File Writes
    thehackernews · https://thehackernews.com/2026/10/critical-fortimail-zero-day-flaw.html
  13. 2026-10-05 06:40Z
    New NetScaler Zero-Day Exploited in Targeted Attacks Can Knock SAML Deployments Offline
    thehackernews · https://thehackernews.com/2026/10/new-netscaler-zero-day-exploited-in.html

this entry in the feed

GET /api/v1/feed/CVE-2026-88771

{
  "etk_id": "ETK-2026-7",
  "cve_id": "CVE-2026-88771",
  "display_id": "CVE-2026-88771",
  "ghsa_id": null,
  "euvd_id": "EUVD-2026-87958",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Improper input validation in Citrix NetScaler ADC and Gateway",
  "summary": "Citrix NetScaler ADC and Gateway releases before the listed fixed versions are affected by improper input validation. An unauthenticated attacker may be able to execute arbitrary commands against a vulnerable appliance. Exposure requires a reachable vulnerable ADC or Gateway instance.",
  "mitigation": "Upgrade ADC to 14.1-73.37, 13.1-64.23, 14.1-73.37 FIPS, or 13.1.37.279 FIPS and NDcPP, as applicable. Upgrade Gateway to 14.1-73.37 or 13.1-64.23.",
  "vendor": "Citrix",
  "product": "NetScaler",
  "affected": [
    {
      "affected_notes": [
        ">= 0, < 14.1-73.37 FIPS",
        ">= 0, < 13.1.37.279 FIPS and NDcPP"
      ],
      "affected_ranges": [
        ">= 0, < 14.1-73.37",
        ">= 0, < 13.1-64.23"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "14.1-73.37",
        "13.1-64.23",
        "14.1-73.37 FIPS",
        "13.1.37.279 FIPS and NDcPP"
      ],
      "package_name": "ADC",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 14.1-73.37",
        ">= 0, < 13.1-64.23"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "14.1-73.37",
        "13.1-64.23"
      ],
      "package_name": "Gateway",
      "purl": null
    }
  ],
  "cwes": [
    20
  ],
  "cvss_score": 9.8,
  "cvss_src": "nvd",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": 0.0108,
  "epss_percentile": 0.6472,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 7.864985066666667,
  "t0_at": "2026-09-27T16:02:07.001000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-02T00:57:22.584434+00:00",
      "days": 4.371708141597222,
      "is_lower_bound": false,
      "measured_at": "2026-09-27T16:02:07.001000+00:00",
      "url": null
    },
    "kev": {
      "at": "2026-09-27T21:30:35.552100+00:00",
      "days": 0.22810823032407407,
      "is_lower_bound": false,
      "measured_at": "2026-09-27T16:02:07.001000+00:00",
      "precision": "exact",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-88771"
    },
    "public_poc": {
      "at": "2026-09-27T18:15:38+00:00",
      "days": 0.09271989583333333,
      "is_lower_bound": false,
      "measured_at": "2026-09-27T16:02:07.001000+00:00",
      "url": "https://github.com/watchtowrlabs/watchTowr-vs-Citrix-Netscaler-CVE-2026-88771"
    },
    "trigger_signal": {
      "at": "2026-09-27T00:00:00+00:00",
      "days": -0.6681365856481482,
      "is_lower_bound": false,
      "measured_at": "2026-09-27T16:02:07.001000+00:00",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-88771"
    }
  }
}

published 2026-09-29 20:06Z
last change 2026-10-21 03:57Z

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