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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.\nhttps://www.cve.org/CVERecord?id=CVE-2026-57196https://github.com/asterisk/asterisk/security/advisories/GHSA-4pgv-j3mr-3rcphttps://github.com/asterisk/asterisk/commit/4373f8174bf71c467fc9db96036126d30425b9e8https://github.com/asterisk/asterisk/commit/4b360a61d649a7c12b1021aa554642322ee28c10https://github.com/asterisk/asterisk/commit/60c23d8b56b2cf93caceb527e07654b16f388343https://github.com/asterisk/asterisk/commit/87399593cda601ae3670bf890bdb32f78e881bf3https://github.com/asterisk/asterisk/commit/9cff8e62fbd9e7db87c233de3335047df88877d0https://github.com/asterisk/asterisk/commit/dc43c5b32a3a216da4c9e95388fbadaca3e78bc8https://github.com/asterisk/asterisk/commit/e6998409f73f49959d0062c695bb9a2f611af5achttps://github.com/asterisk/asterisk/releases/tag/20.20.1https://github.com/asterisk/asterisk/releases/tag/21.12.3https://github.com/asterisk/asterisk/releases/tag/22.10.1https://github.com/asterisk/asterisk/releases/tag/23.4.1https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3https://github.com/asterisk/asterisk/tree/24.0.0-pre1#asterisk 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