Public mode

No access to your tenant or devices. Every item links to its source. What this means

Some sources, documents or advisories need attention: 275/275 feeds/APIs · 469/469 docs · 8/9 advisories · checked 02:38 UTC Customize Public modeDiscuss ChangeIntel on Discord

Recorded 20 Oct 2026 at 20:53 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.

The historical “Publicly disclosed: No” field could represent a missing MSRC assessment. It does not establish that the vulnerability was undisclosed. The original recorded fields remain below.

Microsoft Office Remote Code Execution Vulnerability

Out-of-bounds write in Microsoft Office allows an unauthorized attacker to execute code over a network.

What it said

CVE
CVE-2026-78524
Severity
Important
CVSS base score
8.8
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Remote Code Execution
Exploitation detected
Not reported by MSRC
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Component
Microsoft Office
Weakness
CWE-787: Out-of-bounds Write
Issued by
Microsoft
Customer action
Required: apply the update
Affected products
Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office 365 for Mac, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2021, Microsoft Office LTSC for Mac 2024
Updates that fix it
KB5002916: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
CISA KEV
Not listed in the collected catalog
EPSS
0.8%; scored 20 Oct 2026
Public exploit code
No Nuclei template listed
Published
8 Sep 2026 07:00 UTC
Last revised
16 Oct 2026 07:00 UTC
Revision note
Updated an acknowledgement. This is an informational change only.

Source evidence when recorded

Microsoft security releases
Complete at observationRead 20 Oct 2026 at 20:53 UTC
CISA KEV
Complete at observationRead 20 Oct 2026 at 20:53 UTC
FIRST EPSS
Complete at observationRead 20 Oct 2026 at 20:53 UTC
Public detection templates (Nuclei)
Complete at observationRead 20 Oct 2026 at 20:53 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (9)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 20 Oct 2026 · 20:53:31 UTC EPSS0.8%; scored 19 Oct 2026 → 0.8%; scored 20 Oct 2026
  2. 19 Oct 2026 · 15:12:40 UTC EPSS0.8%; scored 18 Oct 2026 → 0.8%; scored 19 Oct 2026
  3. 18 Oct 2026 · 14:54:30 UTC EPSS0.8%; scored 16 Oct 2026 → 0.8%; scored 18 Oct 2026
  4. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  5. 16 Oct 2026 · 16:13:25 UTC EPSS0.8%; scored 15 Oct 2026 → 0.8%; scored 16 Oct 2026
  6. 16 Oct 2026 · 15:49:54 UTC Last revised21 Sep 2026 07:00 UTC → 16 Oct 2026 07:00 UTC
  7. 15 Oct 2026 · 21:30:54 UTC EPSS0.8%; scored 14 Oct 2026 → 0.8%; scored 15 Oct 2026
  8. 15 Oct 2026 · 01:07:54 UTC EPSS0.8%; scored 13 Oct 2026 → 0.8%; scored 14 Oct 2026
  9. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 11 Nov 02:38 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current