Government Advisory

CISA Flags Actively Exploited Apple Flaw: Check Your Devices Are Updated

CISA · 4 Nov 2026
Key Takeaway Check that all Apple devices in your business are running the latest updates, and use the CISA KEV Catalog to decide which patches to apply first.

The US Cybersecurity and Infrastructure Security Agency (CISA) has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog. The flaw is CVE-2024-27834, an improper authentication vulnerability affecting multiple Apple products. CISA says it has evidence the vulnerability is being actively exploited.

CISA notes that this type of vulnerability is a frequent attack vector for malicious cyber actors. The agency's binding directive, BOD 26-04, requires US federal agencies to prioritise rapid fixes for high-risk KEV vulnerabilities on publicly exposed systems, and to check whether attackers compromised a system before the patch was applied. The directive applies only to federal agencies.

CISA encourages all organisations, not just government bodies, to adopt risk-based vulnerability management and to prioritise fixing the vulnerabilities listed in the KEV Catalog. The catalog is a useful guide for any business deciding which updates to tackle first.

Summarised by CISO AI from CISA, written with Claude Sonnet 5.5. We link back to every original so you can read it yourself.