CVE-2026-57196

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.

CVSS 4.0

2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

CWE

CWE-79

Published

2026-10-26

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

References

• https://github.com/asterisk/asterisk/commit/4373f8174bf71c467fc9db96036126d30425b9e8
• https://github.com/asterisk/asterisk/commit/4b360a61d649a7c12b1021aa554642322ee28c10
• https://github.com/asterisk/asterisk/commit/60c23d8b56b2cf93caceb527e07654b16f388343
• https://github.com/asterisk/asterisk/commit/87399593cda601ae3670bf890bdb32f78e881bf3
• https://github.com/asterisk/asterisk/commit/9cff8e62fbd9e7db87c233de3335047df88877d0

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