SOURCE FACT
Apple · Multiple Products
Apple iOS, iPadOS, macOS, and watchOS contain an improper certificate validation vulnerability that can allow a malicious app to bypass signature validation.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA notes
https://support.apple.com/en-us/HT213926, https://support.apple.com/en-us/HT213927, https://support.apple.com/en-us/HT213928, https://support.apple.com/en-us/HT213929, https://support.apple.com/en-us/HT213931 ; https://nvd.nist.gov/vuln/detail/CVE-2023-41991
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