CVE-2025-59236: Microsoft Excel Remote Code Execution Vulnerability

11

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.4% (30-day exploitation probability)+5
Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.42%

ahead of 34% of scored CVEs · Oct 14, 2026

Affects

Microsoft

365 Apps and 9 more

CVSS base

7.8

High · 3 source(s)

Prioritization reference: 8.4 provisional

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

No

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Microsoft 365 Apps, Microsoft Microsoft 365 Apps for Enterprise, Microsoft Microsoft Office 2019…).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Microsoft	365 Apps	versions not specified by the source	Vulnerable	NIST National Vulnerability Database
Microsoft	Microsoft 365 Apps for Enterprise	≥ 16.0.1 and < https://aka.ms/OfficeSecurityReleases	Vulnerable	CVE Program (cve.org) e CISA ADP
Microsoft	Microsoft Office 2019	≥ 19.0.0 and < https://aka.ms/OfficeSecurityReleases	Vulnerable	CVE Program (cve.org) e CISA ADP
Microsoft	Microsoft Office LTSC 2021	≥ 16.0.1 and < https://aka.ms/OfficeSecurityReleases	Vulnerable	CVE Program (cve.org) e CISA ADP
Microsoft	Microsoft Office LTSC 2024	≥ 16.0.0 and < https://aka.ms/OfficeSecurityReleases	Vulnerable	CVE Program (cve.org) e CISA ADP
Microsoft	Microsoft Office LTSC for Mac 2021	≥ 16.0.1 and < 16.102.25101223	Vulnerable	CVE Program (cve.org) e CISA ADP
Microsoft	Microsoft Office LTSC for Mac 2024	≥ 16.0.0 and < 16.102.25101223	Vulnerable	CVE Program (cve.org) e CISA ADP
Microsoft	Office	version 2019	Vulnerable	NIST National Vulnerability Database
Microsoft	Office Long Term Servicing Channel	version 2024version 2021	Vulnerable	NIST National Vulnerability Database
Microsoft	Office Online Server	< 16.0.10417.20059	Vulnerable	NIST National Vulnerability Database
Microsoft	Office Online Server	≥ 16.0.0.0 and < 16.0.10417.20059	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
8.4	CVSS 3.1	High	2.5	5.9	secure@microsoft.com via NIST National Vulnerability Database
8.4	CVSS 3.1	High	—	—	microsoft via CVE Program (cve.org) e CISA ADP
7.8	CVSS 3.1	High	1.8	5.9	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 8.4 (secure@microsoft.com via NIST National Vulnerability Database) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-416 · Use After Free

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.42%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

endpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

2026
Affected products added · microsoft/microsoft 365 apps for enterprise, microsoft/microsoft office 2019, microsoft/microsoft office ltsc 2021, micr
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 7.8
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
2025
CVE published
Oct 14, 2025 · microsoft

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59236
Vendor Advisory, vendor-advisory, patch, NIST National Vulnerability Database

Elsewhere on this site

Microsoft
every CVE for this vendor

Memory corruption
same class

CWE-416
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-102855 Microsoft Office Visio Remote Code Execution Vulnerability 2d
High CVE-2026-97781 Microsoft Office OneNote Remote Code Execution Vulnerability 2d
High CVE-2026-97780 Microsoft Office Excel Remote Code Execution Vulnerability 2d
High CVE-2026-97778 Microsoft Office Excel Remote Code Execution Vulnerability 2d
High CVE-2026-97777 Microsoft Office Excel Remote Code Execution Vulnerability 2d
High CVE-2026-97776 Microsoft Office Excel Remote Code Execution Vulnerability 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-59236 is "Microsoft Excel Remote Code Execution Vulnerability", rated High. It affects 365 Apps (Microsoft); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. EPSS 0.42% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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