Asterisk prior 23.4.1 res_phoneprov cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in Asterisk. This vulnerability affects unknown code of the component res_phoneprov. The manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2026-57196. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Asterisk and classified as problematic. This issue affects an unknown code of the component res_phoneprov. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-57196 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 20.20.1, 21.12.3, 22.10.1, 23.4.1, 20.7-cert11 or 22.8-cert3 eliminates this vulnerability.

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Productinfo

Type

• Communications System

Name

• Asterisk

Website

• Product: https://github.com/asterisk/asterisk/

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