VulnSocial

CVE-2026-40358Patch(microsoft / 365_apps)

LOWCVSS 8.4 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft 365_apps systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • 365_apps
  • office
  • office_long_term_servicing_channel

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
microsoft
Products
365_appsofficeoffice_long_term_servicing_channel

5 versions affected across 3 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-05-12: 1Patch / Workaround · 2026-05-12: 1Technical Details · 2026-05-12: 105-12
Signal classification1 categories
Patch
1100.0%
Referenced assets1 URL
Full discourse1 post
  • WindowsForum@windowsforum
    Patch

    🚨 CVE-2026-40358 Office RCE: Microsoft literally says “patch-now,” not “maybe someone will click the bad thing.” That’s your signal to treat it like real, not theoretical. https://windowsforum.com/threads/cve-2026-40358-office-rce-patch-now-with-microsoft-s-confidence-signal.417951/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #OfficeRce #PatchTuesday #MicrosoftOfficeSecurity #Cve202640358 https://t.co/RvAf5xD8kY

    Post summary

    Microsoft urges immediate patching for CVE‑2026‑40358, an Office remote code execution vulnerability; no PoC or exploit details are provided.

    0000038
    1.1K followersView on X
CPE platform detail12 entries

12 of 12 entries

PartVendorProductVersionTarget SWTarget HW
Appmicrosoft365_apps--x64
Appmicrosoft365_apps--x86
Appmicrosoftoffice2016-x64
Appmicrosoftoffice2016-x86
Appmicrosoftoffice2019-x64
Appmicrosoftoffice2019-x86
Appmicrosoftoffice_long_term_servicing_channel2021-x64
Appmicrosoftoffice_long_term_servicing_channel2021-x86
Appmicrosoftoffice_long_term_servicing_channel2021macos-
Appmicrosoftoffice_long_term_servicing_channel2024-x64
Appmicrosoftoffice_long_term_servicing_channel2024-x86
Appmicrosoftoffice_long_term_servicing_channel2024macos-

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