critical Known exploitedREV. 01
CVE-2026-19490Citrix NetScaler — Authentication Bypass via Alternate Path
Citrix NetScaler appliances set up as a gateway or authentication server let an unauthenticated remote attacker get past the login through an alternate path or channel, and the flaw is already being used in real attacks.
Read the risk
THE VITAL STATS- CVSS score
- 9.8/ 10 CVSS v3.1
- EPSS probability
- 6% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-08-19
- Added to KEV
- 2026-09-09
- Exploit published
- Not recorded
- Confidence
- medium
- Kill chain
- initial access
- MITRE ATT&CK
- T1190, T1078
- Severity
- critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attacker needsNetwork access to a NetScaler appliance configured as an authentication virtual server or as a gateway
Behind the card
3 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorysupport.citrix.comsupport.citrix.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-20 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.