- Published
- Source
- watchTowr Labs
- Filed under
- Zero-days, Malware & exploits
- Vulnerabilities
- 1 CVE Exploited
God damn it, we're back in the room again. Yes, that sound in your ears is screaming. The footgun has gone off again, shockingly, and we are yet again dealing with a situation where the entire world apparently knew about Citrix NetScaler CVEs before Citrix had woken up…
If you run the affected product
- Find every instance – especially the ones reachable from the internet.
- Apply the vendor's patch or mitigation now: exploited flaws are fixed in days, not at the next patch cycle.
- Then check for signs it was used before you patched: web shells, new accounts, unusual outbound traffic.
More helpCISA's Known Exploited Vulnerabilities catalogue (opens in a new tab)
The vulnerabilities in this story
CVE-2026-88771 in the NVD (opens in a new tab)
- CVSS9.8Critical
- EPSS1.1%chance of exploitation in 30 days
- CISA KEVExploitedon the list since 27 Sep
Exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog (CC0). Exploit prediction: EPSS by FIRST. This product uses the NVD API but is not endorsed or certified by the NVD.
Defender’s notebook
The attacker technique behind this story, in MITRE’s terms – and what to check in your own estate.
External Remote Services
Persistence, Initial AccessWhat a defender checks
- List every VPN, remote desktop and remote-access gateway you expose.
- Require MFA on all of them, and keep them patched.
- Alert on sign-ins from new countries, networks or devices.
Build the skillBlue Team Engineer · Network Security Engineering
© 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation.
MyCyberWay training
Blue Team Analyst · Vulnerability Management
You can't patch everything at once. Learn what to fix first.
In our Blue Team Analyst programme you run a vulnerability scan, prioritise the output with CVSS, EPSS and asset criticality, and track remediation to closure with the teams who own the fix.
- Read scanner output properly
- Prioritise with CVSS, EPSS and asset criticality
- Track remediation to closure
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