CVE-2026-55124
MEDIUMCVSS 5.5/10EPSS 0.39%
Last modified
CVE-2026-55124 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Improper validation of specified type of input in Microsoft Office Word allows an unauthorized attacker to disclose information locally.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.
Description
Improper validation of specified type of input in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | 365 Apps | All versions |
| Microsoft | Microsoft 365 | All versions |
| Microsoft | Office 2019 | All versions |
| Microsoft | Office 2021 | All versions |
| Microsoft | Office 2024 | All versions |
| Microsoft | Office Online Server | < 16.0.10417.20175 |
| Microsoft | Sharepoint Server | < 16.0.19725.20434 |
| Microsoft | Sharepoint Server | 2016 |
| Microsoft | Sharepoint Server | 2019 |
| Microsoft | Word | 2016 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55124Vendor Advisory, Patch
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-55124?
Improper validation of specified type of input in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
How severe is CVE-2026-55124?
CVE-2026-55124 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.
How do I fix CVE-2026-55124?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-55119A malicious actor with access to the network and low privile…8.1
- CVE-2026-5512An improper authorization vulnerability was identified in Gi…4.3
- CVE-2026-55120Heap-based buffer overflow in Microsoft Office PowerPoint al…7.8
- CVE-2026-55121Out-of-bounds read in Microsoft Office allows an unauthorize…5.5
- CVE-2026-55122Out-of-bounds read in Microsoft Office Excel allows an unaut…7.1
- CVE-2026-55123Heap-based buffer overflow in Microsoft Office PowerPoint al…7.8
- CVE-2026-55125Heap-based buffer overflow in Microsoft Office allows an una…7.8
- CVE-2026-55126Improper neutralization of input during web page generation …5.4
- CVE-2026-55127Heap-based buffer overflow in Microsoft Office Word allows a…7.8
- CVE-2026-55128Use after free in Microsoft Office Word allows an unauthoriz…7.8
- CVE-2026-55129Heap-based buffer overflow in Microsoft Office allows an una…7.8
- CVE-2026-5513The Online Scheduling and Appointment Booking System – Bookl…7.2
Are you affected by CVE-2026-55124?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST