CVE-2026-20152

Cisco Secure Web Appliance Authentication Service Traffic Bypass Vulnerability

Published Apr 15, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Secure Web Appliance

unknown

Version	Status	Constraints
`11.8.0-453`	affected	—
`12.5.3-002`	affected	—
`12.0.3-007`	affected	—
`12.0.3-005`	affected	—
`14.1.0-032`	affected	—
`14.1.0-047`	affected	—
`14.1.0-041`	affected	—
`12.0.4-002`	affected	—
`14.0.2-012`	affected	—
`11.8.0-414`	affected	—
`12.0.1-268`	affected	—
`11.8.1-023`	affected	—
`11.8.3-021`	affected	—
`11.8.3-018`	affected	—
`12.5.1-011`	affected	—
`11.8.4-004`	affected	—
`12.5.2-007`	affected	—
`12.5.2-011`	affected	—
`14.5.0-498`	affected	—
`12.5.4-005`	affected	—
`12.5.4-011`	affected	—
`12.0.5-011`	affected	—
`14.0.3-014`	affected	—
`12.5.5-004`	affected	—
`12.5.5-005`	affected	—
`12.5.5-008`	affected	—
`14.0.4-005`	affected	—
`14.5.1-008`	affected	—
`14.5.1-016`	affected	—
`15.0.0-355`	affected	—
`15.0.0-322`	affected	—
`12.5.6-008`	affected	—
`15.1.0-287`	affected	—
`14.5.2-011`	affected	—
`15.2.0-116`	affected	—
`14.0.5-007`	affected	—
`15.2.0-164`	affected	—
`14.5.1-510`	affected	—
`12.0.2-012`	affected	—
`12.0.2-004`	affected	—
`14.5.1-607`	affected	—
`14.5.3-033`	affected	—
`15.0.1-004`	affected	—
`15.2.1-011`	affected	—
`14.5.0-673`	affected	—
`14.5.0-537`	affected	—
`12.0.1-334`	affected	—
`14.0.1-503`	affected	—
`14.0.1-053`	affected	—
`11.8.0-429`	affected	—
`14.0.1-040`	affected	—
`14.0.1-014`	affected	—
`12.5.1-043`	affected	—
`15.2.2-009`	affected	—
`15.2.3-007`	affected	—
`15.2.4-022`	affected	—
`15.2.5-011`	affected	—
`15.2.5-013`	affected	—
`14.6.0-108`	affected	—

No data.

Vendor Product Versions

Cisco

Secure Web Appliance

Version	Status	Scheme	Platform
`11.8.0-453`	affected	semver	—
`12.5.3-002`	affected	semver	—
`12.0.3-007`	affected	semver	—
`12.0.3-005`	affected	semver	—
`14.1.0-032`	affected	semver	—
`14.1.0-047`	affected	semver	—
`14.1.0-041`	affected	semver	—
`12.0.4-002`	affected	semver	—
`14.0.2-012`	affected	semver	—
`11.8.0-414`	affected	semver	—
`12.0.1-268`	affected	semver	—
`11.8.1-023`	affected	semver	—
`11.8.3-021`	affected	semver	—
`11.8.3-018`	affected	semver	—
`12.5.1-011`	affected	semver	—
`11.8.4-004`	affected	semver	—
`12.5.2-007`	affected	semver	—
`12.5.2-011`	affected	semver	—
`14.5.0-498`	affected	semver	—
`12.5.4-005`	affected	semver	—
`12.5.4-011`	affected	semver	—
`12.0.5-011`	affected	semver	—
`14.0.3-014`	affected	semver	—
`12.5.5-004`	affected	semver	—
`12.5.5-005`	affected	semver	—
`12.5.5-008`	affected	semver	—
`14.0.4-005`	affected	semver	—
`14.5.1-008`	affected	semver	—
`14.5.1-016`	affected	semver	—
`15.0.0-355`	affected	semver	—
`15.0.0-322`	affected	semver	—
`12.5.6-008`	affected	semver	—
`15.1.0-287`	affected	semver	—
`14.5.2-011`	affected	semver	—
`15.2.0-116`	affected	semver	—
`14.0.5-007`	affected	semver	—
`15.2.0-164`	affected	semver	—
`14.5.1-510`	affected	semver	—
`12.0.2-012`	affected	semver	—
`12.0.2-004`	affected	semver	—
`14.5.1-607`	affected	semver	—
`14.5.3-033`	affected	semver	—
`15.0.1-004`	affected	semver	—
`15.2.1-011`	affected	semver	—
`14.5.0-673`	affected	semver	—
`14.5.0-537`	affected	semver	—
`12.0.1-334`	affected	semver	—
`14.0.1-503`	affected	semver	—
`14.0.1-053`	affected	semver	—
`11.8.0-429`	affected	semver	—
`14.0.1-040`	affected	semver	—
`14.0.1-014`	affected	semver	—
`12.5.1-043`	affected	semver	—
`15.2.2-009`	affected	semver	—
`15.2.3-007`	affected	semver	—
`15.2.4-022`	affected	semver	—
`15.2.5-011`	affected	semver	—
`15.2.5-013`	affected	semver	—
`14.6.0-108`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.305% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-auth-bypass-6YZkTQhd

History

Apr 16, 2026 9:30 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco secure Web Appliance
Vendors & Products		Cisco Cisco secure Web Appliance

Apr 15, 2026 5:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Apr 15, 2026 4:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		Cisco Secure Web Appliance Authentication Service Traffic Bypass Vulnerability
Weaknesses		CWE-305
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-auth-bypass-6YZkTQhd
Metrics		cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}`