# Microsoft Office LTSC for Mac 2021 vulnerabilities

Source: https://junglewise.ai/threats/technologies/office-ltsc-for-mac-2021  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/office-ltsc-for-mac-2021.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 45 vulnerabilities in Microsoft Office LTSC for Mac 2021: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-56195, was published on 14 July 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 45 (0 critical, 0 exploited in the wild)

## About Microsoft Office LTSC for Mac 2021

Office productivity suite for macOS with applications for word processing, spreadsheets, and presentations.

## Latest Microsoft Office LTSC for Mac 2021 vulnerabilities

- [CVE-2026-56195: Microsoft Office out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-56195-microsoft-office-out-of-bounds-read-information-disclosure) (medium, CVSS 5.5, published 14 Jul 2026)
- [CVE-2026-56156: Microsoft Office Excel heap buffer overflow](https://junglewise.ai/threats/cve-2026-56156-microsoft-office-excel-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55949: Microsoft Excel use of uninitialized resource code execution](https://junglewise.ai/threats/cve-2026-55949-microsoft-excel-use-of-uninitialized-resource-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55898: Microsoft Office Excel out-of-bounds read](https://junglewise.ai/threats/cve-2026-55898-microsoft-office-excel-out-of-bounds-read) (medium, CVSS 6.1, published 14 Jul 2026)
- [CVE-2026-55140: Microsoft Office heap buffer overflow](https://junglewise.ai/threats/cve-2026-55140-microsoft-office-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55139: Microsoft Office out-of-bounds read](https://junglewise.ai/threats/cve-2026-55139-microsoft-office-out-of-bounds-read) (medium, CVSS 5.5, published 14 Jul 2026)
- [CVE-2026-55138: Microsoft Excel untrusted pointer dereference information disclosure](https://junglewise.ai/threats/cve-2026-55138-microsoft-excel-untrusted-pointer-dereference-information) (medium, CVSS 5.5, published 14 Jul 2026)
- [CVE-2026-55137: Microsoft Office Excel heap buffer overflow](https://junglewise.ai/threats/cve-2026-55137-microsoft-office-excel-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55133: Microsoft Office OneNote heap overflow code execution](https://junglewise.ai/threats/cve-2026-55133-microsoft-office-onenote-heap-overflow-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55132: Microsoft Office Word double free local code execution](https://junglewise.ai/threats/cve-2026-55132-microsoft-office-word-double-free-local-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55123: Microsoft PowerPoint heap overflow in numeric type conversion](https://junglewise.ai/threats/cve-2026-55123-microsoft-powerpoint-heap-overflow-in-numeric-type-conversion) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55120: Microsoft PowerPoint heap overflow code execution](https://junglewise.ai/threats/cve-2026-55120-microsoft-powerpoint-heap-overflow-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55057: Microsoft Office integer overflow information disclosure](https://junglewise.ai/threats/cve-2026-55057-microsoft-office-integer-overflow-information-disclosure) (medium, CVSS 5.5, published 14 Jul 2026)
- [CVE-2026-55056: Microsoft Office heap buffer overflow](https://junglewise.ai/threats/cve-2026-55056-microsoft-office-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55054: Microsoft Excel out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-55054-microsoft-excel-out-of-bounds-read-information-disclosure) (medium, CVSS 6.5, published 14 Jul 2026)
- [CVE-2026-55053: Microsoft Excel heap buffer overflow code execution](https://junglewise.ai/threats/cve-2026-55053-microsoft-excel-heap-buffer-overflow-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55050: Microsoft Office Word out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-55050-microsoft-office-word-out-of-bounds-read-information-disclosure) (medium, CVSS 5.5, published 14 Jul 2026)
- [CVE-2026-55049: Microsoft Office heap buffer overflow code execution](https://junglewise.ai/threats/cve-2026-55049-microsoft-office-heap-buffer-overflow-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55048: Microsoft Excel integer overflow local code execution](https://junglewise.ai/threats/cve-2026-55048-microsoft-excel-integer-overflow-local-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55044: Microsoft Office Excel out-of-bounds read code execution](https://junglewise.ai/threats/cve-2026-55044-microsoft-office-excel-out-of-bounds-read-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55043: Microsoft PowerPoint heap overflow remote code execution](https://junglewise.ai/threats/cve-2026-55043-microsoft-powerpoint-heap-overflow-remote-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55042: Microsoft Office information disclosure via uninitialized resource](https://junglewise.ai/threats/cve-2026-55042-microsoft-office-information-disclosure-via-uninitialized) (medium, CVSS 5.5, published 14 Jul 2026)
- [CVE-2026-55041: Microsoft Excel heap buffer overflow code execution](https://junglewise.ai/threats/cve-2026-55041-microsoft-excel-heap-buffer-overflow-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55039: Microsoft Office Excel integer underflow code execution](https://junglewise.ai/threats/cve-2026-55039-microsoft-office-excel-integer-underflow-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55037: Microsoft Office Excel heap buffer overflow](https://junglewise.ai/threats/cve-2026-55037-microsoft-office-excel-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)

## Most severe Microsoft Office LTSC for Mac 2021 vulnerabilities

- [CVE-2026-33115: Microsoft Office Word use after free code execution](https://junglewise.ai/threats/cve-2026-33115-microsoft-office-word-use-after-free-code-execution) (high, CVSS 8.4, published 14 Apr 2026)
- [CVE-2026-33114: Microsoft Office Word untrusted pointer dereference](https://junglewise.ai/threats/cve-2026-33114-microsoft-office-word-untrusted-pointer-dereference) (high, CVSS 8.4, published 14 Apr 2026)
- [CVE-2026-33095: Microsoft Office Word use after free code execution](https://junglewise.ai/threats/cve-2026-33095-microsoft-office-word-use-after-free-code-execution) (high, CVSS 7.8, published 14 Apr 2026)
- [CVE-2026-56156: Microsoft Office Excel heap buffer overflow](https://junglewise.ai/threats/cve-2026-56156-microsoft-office-excel-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55949: Microsoft Excel use of uninitialized resource code execution](https://junglewise.ai/threats/cve-2026-55949-microsoft-excel-use-of-uninitialized-resource-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55140: Microsoft Office heap buffer overflow](https://junglewise.ai/threats/cve-2026-55140-microsoft-office-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55137: Microsoft Office Excel heap buffer overflow](https://junglewise.ai/threats/cve-2026-55137-microsoft-office-excel-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55133: Microsoft Office OneNote heap overflow code execution](https://junglewise.ai/threats/cve-2026-55133-microsoft-office-onenote-heap-overflow-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55132: Microsoft Office Word double free local code execution](https://junglewise.ai/threats/cve-2026-55132-microsoft-office-word-double-free-local-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-55123: Microsoft PowerPoint heap overflow in numeric type conversion](https://junglewise.ai/threats/cve-2026-55123-microsoft-powerpoint-heap-overflow-in-numeric-type-conversion) (high, CVSS 7.8, published 14 Jul 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Microsoft technologies

- [Microsoft Windows](https://junglewise.ai/threats/technologies/windows): 2,362 vulnerabilities
- [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10): 589 vulnerabilities
- [Microsoft Windows 11 24h2](https://junglewise.ai/threats/technologies/windows-11-24h2): 565 vulnerabilities
- [Microsoft Windows 11 25h2](https://junglewise.ai/threats/technologies/windows-11-25h2): 534 vulnerabilities
- [Microsoft Windows Server 2025](https://junglewise.ai/threats/technologies/windows-server-2025): 534 vulnerabilities
- [Microsoft Windows Server 2022](https://junglewise.ai/threats/technologies/windows-server-2022): 528 vulnerabilities
- [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019): 521 vulnerabilities
- [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012): 517 vulnerabilities
- [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11): 494 vulnerabilities
- [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016): 476 vulnerabilities
- [Microsoft Windows 10 1809](https://junglewise.ai/threats/technologies/windows-10-1809): 380 vulnerabilities
- [Microsoft Windows 10 21h2](https://junglewise.ai/threats/technologies/windows-10-21h2): 373 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Microsoft Office LTSC for Mac 2021 vulnerabilities", https://junglewise.ai/threats/technologies/office-ltsc-for-mac-2021, 11 November 2026.