This issue was addressed through improved state management. This issue is fixed in macOS Tahoe 26.6. An attacker may be able to modify the state of the Keychain.
26.6Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:HA:N7.5/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N