Mandiant
Every ZeroDayFeed story on Mandiant — across breaches, zero-days, ransomware, patches, policy, and industry, newest first.
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Zero-Days & Exploits
Citrix NetScaler zero-day CVE-2026-88771 moves to mass exploitation after PoC; CVE-2026-88772 also exploited
Two NetScaler ADC and Gateway flaws rated CVSS v4 9.5 were exploited before disclosure; CVE-2026-88771 was then attacked widely after a public PoC. Responders found stolen config archives and webshells, and CISA's September 30 deadline has passed.
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Zero-Days & Exploits
CISA orders patching of exploited Fortinet path-traversal flaw tied to stealthy FortiGate implant at telecom
CISA added Fortinet's CVE-2025-61624 to its KEV catalog with an Oct 19 deadline and a forensic-triage requirement, as Palo Alto Networks links the flaw to a long-running telecom intrusion using a memory-resident FortiGate implant it calls PeerStitch.
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Zero-Days & Exploits
Chinese espionage group exploited BeyondTrust Remote Support zero-day since August; CISA deadline is today
BeyondTrust has patched CVE-2026-102764, a Remote Support authentication bypass that Mandiant says has been exploited since Aug. 29 by Armory Castle (formerly UNC5221). CISA's KEV deadline for federal agencies is Oct. 19.
