Microsoft Office up to LTSC 2024 buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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5.1$5k-$25k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Microsoft Office 365 Apps for Enterprise/2016/2019/LTSC 2021/LTSC 2024. The impacted element is an unknown function. Such manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-50301. Local access is required to approach this attack. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Microsoft Office 365 Apps for Enterprise/2016/2019/LTSC 2021/LTSC 2024 and classified as problematic. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is shared for download at msrc.microsoft.com. This vulnerability is handled as CVE-2026-50301 since 06/04/2026. The exploitation is known to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/28/2026).

The vulnerability scanner Nessus provides a plugin with the ID 326874 (Security Updates for Microsoft Office Products (July 2026)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (326874) and CERT Bund (WID-SEC-2026-2317). Once again VulDB remains the best source for vulnerability data.

Affected

  • Microsoft Excel
  • Microsoft Word
  • Microsoft PowerPoint
  • Microsoft Office
  • Microsoft SharePoint
  • Microsoft SharePoint Server 2019
  • Microsoft 365 Apps
  • Microsoft Office Online Server
  • Microsoft Office 365

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 326874
Nessus Name: Security Updates for Microsoft Office Products (July 2026)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/04/2026 CVE reserved
07/14/2026 +40 days Advisory disclosed
07/14/2026 +0 days VulDB entry created
07/28/2026 +14 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-50301 (🔒)
GCVE (CVE): GCVE-0-2026-50301
GCVE (VulDB): GCVE-100-378572
CERT Bund: WID-SEC-2026-2317 - Microsoft Office Produkte: Mehrere Schwachstellen

Entryinfo

Created: 07/14/2026 22:02
Updated: 07/28/2026 13:05
Changes: 07/14/2026 22:02 (52), 07/15/2026 06:19 (2), 07/17/2026 08:05 (6), 07/28/2026 13:02 (1), 07/28/2026 13:05 (4)
Complete: 🔍
Committer: lywand
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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