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TI-2023-21258 Aliases CVE-2023-40440GHSA-ppmf-rp3c-49x9

Apple macOS: A S/MIME encrypted email may be inadvertently sent unencrypted

Priority MEDIUM 40Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

This issue was addressed with improved state management of S/MIME encrypted emails. This issue is fixed in macOS Monterey 12.6.8. A S/MIME encrypted email may be inadvertently sent unencrypted.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00548 46th percentileScored 2026-11-07
Fix Fixed macOS (Apple): 12.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApplemacOSbefore 12.612.6Patch availableCNA
  • macOS VendorApple Affected before 12.6 Fixed in 12.6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*12.0.0 to before 12.6.8VulnerableApple
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions 12.0.0 to before 12.6.8 Vulnerable ·Apple

Remediation

  • Fix · CNA macOS (Apple) Fixed in 12.6

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Apple macOS 12.6

    3 records Highest priority Priority CRITICAL 1 CRITICAL, 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2023-22371 Apple iOS and iPadOS: Processing a font file may lead to arbitrary code executionPriority CRITICAL 93
    • TI-2023-21260 Sensitive information in log files in Apple iOS and iPadOSPriority LOW 15
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-40440
  2. 2026-10-03 Alias added: GHSA-ppmf-rp3c-49x9

References

Advisory 1

Other 1

  • TI-2026-46583 Improper authentication in Apple macOS KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-28008 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-22441 Apple iOS and iPadOS: An attacker with arbitrary read and write capability may be able to… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-22440 Memory corruption in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-17951 Out-of-bounds write in Apple Safari KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-17847 Use after free in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
See all 3490 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences