CVE-2026-77900
Azure App Service Remote Code Execution Vulnerability
Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Azure App Service Remote Code Execution Vulnerability
Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-77900- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-306
- Updated
- 2026-11-02
EUVDEUVD-2026-95394
Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-95394- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-9x98-433f-w7ff
Missing authentication for critical function in Azure App Service allows an unauthorized attacker...
Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
- Record
GHSA-9x98-433f-w7ff- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-306
- Updated
- 2026-11-02
NVD
Missing authentication for critical function in Azure App Service allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-77900- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-306
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-77900 is a critical vulnerability (CVSS 9.8) in Microsoft Azure App Service For Linux, published October 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.72%, the 54th percentile. No source names a fixed version.