Medium [CVE-2026-20152] Cisco Secure Web Appliance Authentication Bypass Vulnerability
This medium-severity Cisco advisory covers CVE-2026-20152 affecting Secure Web Appliance.
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Summary
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.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
- Scope: At the time of publication, this vulnerability affected Cisco Secure Web Appliance, both virtual and hardware versions.
- Earlier than 15.2 — Migrate to a fixed release
- Release 15.2 (first fixed: 15.2.5-013)
- 15.5 — Migrate to a fixed release
- Release 16.0 (first fixed: Not affected)
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 15.2.5-013
- Not affected
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
- Earlier than 15.2: migrate to a fixed release.
- Release 15.2: upgrade to 15.2.5-013.
- Release 15.5: migrate to a fixed release.
- Release 16.0: upgrade to Not affected.
- There are no workarounds that address this vulnerability.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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