10.0Critical
Microsoft Azure Web Apps
CVE-2026-65816
Use of incorrectly-resolved name or reference in Azure Arc allows an unauthorized attacker to elevate privileges over a network.
What this means for your business
- It affects Microsoft Azure Web Apps. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 0.5% chance of attack attempts being seen in the next 30 days, ranking above 43% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Microsoft Azure Web Apps, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Fastnexa security experts
Not sure if your company is exposed to CVE-2026-65816?
Tell us where you run Microsoft Azure Web Apps and a Fastnexa penetration tester will check whether this flaw, or others like it, can be used against your websites, apps and network.
The full test is free for our first 10 founding clients until 31 December 2026. See the offer
Think you’ve already been hit? Don’t wait on a form: call or WhatsApp +1 (732) 454 2616. We reply within 1 hour, 24/7. Emergency help →
Scoring
- CVSS
- 10.0 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H- Weakness
- CWE-706
- Assigned by
- secure@microsoft.com
Dates
- Published
- 2026-08-20
- Last modified
- 2026-08-24
- Sources
- NVD
Affected products
- Microsoft Azure Web Appsall versions
As listed in the NVD configuration data. Not a statement about your estate.