CVE-2026-26134 Microsoft Office Elevation of Privilege Vulnerability
High 7.8
Published
Updated
Check this codebase for CVE-2026-26134 and fix it if it is affected.
What it is: CVE-2026-26134 is a high-severity vulnerability in Microsoft 365 Copilot, published on 10 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-26134 in the wild and no public exploit code.
Affected product: Microsoft 365 Copilot. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-26134/ (Markdown: https://insights.sbomify.com/CVE-2026-26134/index.md)
An integer overflow in Microsoft Office for Android allows a local attacker to elevate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-26134?
CVE-2026-26134 is a high-severity vulnerability in Microsoft 365 Copilot, published on 10 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Integer overflow or wraparound in Microsoft Office allows an authorized attacker to elevate privileges locally.
Which versions are affected by CVE-2026-26134?
It affects 1 product.
Products include Microsoft 365 Copilot.
How do I fix CVE-2026-26134?
No fix has been published for CVE-2026-26134 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-26134 being exploited?
There is no known exploitation of CVE-2026-26134 in the wild and no public exploit code.
Other vulnerabilities in Microsoft 365 Copilot
- CVE-2026-85885 Microsoft 365 Copilot Elevation of Privilege Vulnerability
- CVE-2026-50517 Microsoft M365 Copilot Remote Code Execution Vulnerability
- CVE-2026-54130 M365 Copilot Information Disclosure Vulnerability
- CVE-2025-60724 GDI+ Remote Code Execution Vulnerability
- CVE-2025-53766 GDI+ Remote Code Execution Vulnerability
Sources
Also known as GHSA-46v7-2rrf-mc24.