{"schema":"threatline.record/2","record":{"id":"CVE-2026-88771","aliases":[],"summary":"Citrix NetScaler Improper Input Validation Vulnerability","details":"Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.","categories":["Network & edge"],"product":"NetScaler","vendor":"Citrix","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","source_modified_at":"2026-09-29T03:55:15.090Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"ADC","vendor":"Citrix NetScaler","versions":[{"lessThan":"14.1-73.37","status":"affected","version":"0","versionType":"patch"},{"lessThan":"13.1-64.23","status":"affected","version":"0","versionType":"patch"},{"lessThan":"14.1-73.37 FIPS","status":"affected","version":"0","versionType":"patch"},{"lessThan":"13.1.37.279 FIPS and NDcPP","status":"affected","version":"0","versionType":"patch"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","source_modified_at":"2026-09-29T03:55:15.090Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Gateway","vendor":"Citrix NetScaler","versions":[{"lessThan":"14.1-73.37","status":"affected","version":"0","versionType":"patch"},{"lessThan":"13.1-64.23","status":"affected","version":"0","versionType":"patch"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","source_modified_at":"2026-09-29T03:55:15.090Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"ADC","ecosystem":null},"version":"14.1-73.37","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","source_modified_at":"2026-09-29T03:55:15.090Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"ADC","ecosystem":null},"version":"13.1-64.23","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","source_modified_at":"2026-09-29T03:55:15.090Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"ADC","ecosystem":null},"version":"14.1-73.37 FIPS","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","source_modified_at":"2026-09-29T03:55:15.090Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"ADC","ecosystem":null},"version":"13.1.37.279 FIPS and NDcPP","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","source_modified_at":"2026-09-29T03:55:15.090Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Gateway","ecosystem":null},"version":"14.1-73.37","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","source_modified_at":"2026-09-29T03:55:15.090Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Gateway","ecosystem":null},"version":"13.1-64.23","basis":"first unaffected version stated in the CVE record"}],"cvss":9.5,"severity":"Critical","kev":{"listed":true,"date_added":"2026-09-27","due_date":"2026-09-30","required_action":"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.","ransomware_campaign_use":"Unknown","forensic_triage":true},"epss":{"probability":0.04722,"percentile":0.91805,"score_date":"2026-10-23"},"published_at":"2026-09-27T16:02:07.001Z","modified_at":"2026-09-29T03:55:15.090Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-88771","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-09-29T03:55:15.090Z"},{"source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/freebsd/http/citrix_netscaler_cve_2026_88771.rb","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-09-27"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-88771","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Metasploit","EPSS"],"references":[{"source":"CVE List","url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096"},{"url":"https://support.citrix.com/external/article/CTX694799/steps-to-take-if-netscaler-adc-is-suspec.html","source":"CISA KEV"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88772","source":"CISA KEV"},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"yes","technical_impact":"total","assessed_at":"2026-09-27T00:00:00+00:00"},"exploits":[{"added":"2026-10-22","check":true,"date":"2026-09-27","kind":"Exploit module","name":"Citrix NetScaler Unauthenticated Login Log Command Injection (CVE-2026-88771)","source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/freebsd/http/citrix_netscaler_cve_2026_88771.rb"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-29T03:55:15.090Z","content_hash":"6a36a80b84afbf53a9ba3ad0b441ee75248d93f20393e9786089885bfbd9dc56"}}