CVE-2026-20152 Cisco Secure Web Appliance Authentication Service Traffic Bypass Vulnerability
Unauthenticated remote attackers can bypass authentication policies on Cisco Secure Web Appliances to send restricted HTTP requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20152?
CVE-2026-20152 is a medium-severity authentication bypass vulnerability in Cisco Secure Web Appliance, published on 15 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the authentication service feature of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass authentication policy requirements. This vulnerability is due to improper validation of user-supplied authentication input in HTTP requests. An attacker could exploit this vulnerability by sending HTTP requests that contain specific authentication requests to an affected device. A successful exploit could allow the attacker to bypass policy enforcement on the device. There is no direct impact to the Cisco Secure Web Appliance. However, as a result of exploiting this vulnerability, an attacker could send HTTP requests that should be restricted through the device.
Weakness: CWE-305
Which versions are affected by CVE-2026-20152?
How do I fix CVE-2026-20152?
No fix has been published for CVE-2026-20152 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-20152 being exploited?
There is no known exploitation of CVE-2026-20152 in the wild and no public exploit code.
Sources
Also known as GHSA-v3r6-6788-v9xh.