CVE-2026-85873 Skype for Business Elevation of Privilege Vulnerability
Medium 6.5
Published
Updated
Check this codebase for CVE-2026-85873 and fix it if it is affected.
What it is: CVE-2026-85873 is a medium-severity vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-85873 in the wild and no public exploit code.
Affected product: Microsoft Skype for Business Server 2015 CU13. 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-2026-85873/ (Markdown: https://insights.sbomify.com/CVE-2026-85873/index.md)
An authorized attacker can elevate privileges over the network due to improper authorization in Skype for Business Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85873?
CVE-2026-85873 is a medium-severity vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-639
Which versions are affected by CVE-2026-85873?
How do I fix CVE-2026-85873?
No fix has been published for CVE-2026-85873 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-85873 being exploited?
There is no known exploitation of CVE-2026-85873 in the wild and no public exploit code.
Sources
Also known as GHSA-6286-h9rv-4j7m.