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Exploited vulnerability · CISA KEV

Is CVE-2026-88772 exploited? Yes: in CISA KEV since 27 Sep 2026

Gociux · Citrix NetScaler · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-88772, Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 27 Sep 2026, the day it was published. It affects Citrix NetScaler, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

exploitedYesCISA KEV · 27 Sep 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.5CVSS 4.0 · critical
US federal due30 Sep 2026BOD 22-01 deadline

What it is

Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service

VendorCitrix (27 exploited CVEs in KEV)
ProductNetScaler
VulnerabilityCitrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
WeaknessCWE-119
Published27 Sep 2026
Added to KEV27 Sep 2026
Reported by (CNA)NetScaler

What to do

  1. Check whether you run it. Look for NetScaler in your asset inventory, including appliances and cloud images. Stack check lists every exploited Citrix CVE at once.
  2. Apply the fix. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 27 Sep 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Citrix.

Other exploited CVEs in NetScaler

References

Questions

Is CVE-2026-88772 being exploited?

Yes. CISA added CVE-2026-88772 to the Known Exploited Vulnerabilities catalog on 27 Sep 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-88772 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-88772?

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Check Citrix's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected NetScaler and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in September 2026 · Citrix scorecard · act-now radar.

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