Citrix patches 27 flaws across NetScaler, Gateway
NCSC-NL flags 27 Citrix vulnerabilities, some CVSS 9.5, allowing unauthenticated remote attacks, DoS, or SYSTEM privilege escalation.
Sourceadvisories.ncsc.nl — open the original
What to check
- Applies to
- The 30 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
The Dutch National Cyber Security Centre (NCSC-NL) issued an advisory covering numerous vulnerabilities patched by Citrix across Secure Access Client for Windows, NetScaler ADC, NetScaler Gateway, and NetScaler Console. CVSS v4.0 scores range from roughly 5.3 up to 9.5, with vulnerability classes including hard-coded cryptographic keys, authorization bypass through user-controlled keys, out-of-bounds write (memory corruption), improper authentication, improper privilege management, and missing authorization.
Several of the NetScaler ADC and Gateway flaws can be exploited remotely without prior authentication, which is particularly concerning given these appliances are typically internet-facing VPN/application-delivery gateways. Successful exploitation can lead to denial-of-service, unauthorized access to protected back-end resources, or attainment of SYSTEM-level privileges on Windows systems running the Secure Access Client. Other listed issues require local access or specific product configurations to exploit.
Citrix has released updates addressing all listed CVEs; NCSC-NL did not report evidence of in-the-wild exploitation at time of publication, but given the historical targeting of Citrix NetScaler products by threat actors, defenders should prioritize patching, especially for the unauthenticated remote-exploitable issues (e.g., CVE-2026-107407 through -107413, CVE-2026-120868, CVE-2026-118268).
Mentioned in this report
Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0491.html
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