Bug 2561037 (CVE-2026-57196)

Summary: CVE-2026-57196 asterisk: asterisk: User impersonation via reflected cross-site scripting in phone provisioning error pages
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Asterisk. When phone provisioning (res_phoneprov) is enabled, reflected cross-site scripting in HTTP error pages allows an unauthenticated remote attacker to steal an authorized user's Asterisk Manager Interface (AMI) session cookie and impersonate that user. Exploitation requires convincing an authorized user to follow a malicious link when the HTTP server and manager interface are accessible.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2564784, 2564787, 2564790, 2564792    
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Description OSIDB Bzimport 2026-10-26 19:32:50 UTC 
Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an unauthenticated attacker may use reflected cross-site scripting in `phone provisioning HTTP error pages` to retrieve an authorized user's `AMI session cookie` and impersonate that user when `res_phoneprov` is enabled. The Asterisk HTTP web server, Asterisk Manager Interface (AMI), and AMI access via HTTP must all be enabled; each is disabled by default. The attacker must be able to connect to the HTTP server, which binds only to `127.0.0.1` by default even when enabled, and must convince the authorized user to click a malicious link. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.