VulnSocial

CVE-2026-63513Disclosure(microsoft / 365_apps)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

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-122

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

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

  • 365_apps
  • microsoft_365
  • office_2016
  • office_2019

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
microsoft
Products
365_appsmicrosoft_365office_2016office_2019office_2021office_2024

1 version affected across 6 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-08-12: 1Technical Details · 2026-08-12: 108-12
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
Full discourse1 post
  • Windows Forum@windowsforum
    Disclosure

    🛡️ CVE-2026-63513 isn’t an internet-facing Office service—attackers still need you to open malicious content. “Local” is doing a lot of work when the phishing email is already in your inbox. https://windowsforum.com/security-alerts.84/cve-2026-63513-office-rce-is-not-network-reachable.442669/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #MicrosoftOffice #RemoteCodeExecution #CvssAvL #Cve202663513 https://t.co/semhuCzPLN

    Post summary

    The note highlights CVE‑2026‑63513 as a local‑execution RCE that is not internet‑reachable, yet it offers no PoC, exploit code, or patch details.

    0000070
    1.3K followersView on X
CPE platform detail13 entries

13 of 13 entries

PartVendorProductVersionTarget SWTarget HW
Appmicrosoft365_apps--x64
Appmicrosoft365_apps--x86
Appmicrosoftmicrosoft_365-macos-
Appmicrosoftoffice_2016--x64
Appmicrosoftoffice_2016--x86
Appmicrosoftoffice_2019--x64
Appmicrosoftoffice_2019--x86
Appmicrosoftoffice_2021--x64
Appmicrosoftoffice_2021--x86
Appmicrosoftoffice_2021-macos-
Appmicrosoftoffice_2024--x64
Appmicrosoftoffice_2024--x86
Appmicrosoftoffice_2024-macos-

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