CVE-2026-57196

low

Description

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.

References

https://github.com/asterisk/asterisk/tree/24.0.0-pre1

https://github.com/asterisk/asterisk/security/advisories/GHSA-4pgv-j3mr-3rcp

https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3

https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11

https://github.com/asterisk/asterisk/releases/tag/23.4.1

https://github.com/asterisk/asterisk/releases/tag/22.10.1

https://github.com/asterisk/asterisk/releases/tag/21.12.3

https://github.com/asterisk/asterisk/releases/tag/20.20.1

https://github.com/asterisk/asterisk/commit/e6998409f73f49959d0062c695bb9a2f611af5ac

https://github.com/asterisk/asterisk/commit/dc43c5b32a3a216da4c9e95388fbadaca3e78bc8

https://github.com/asterisk/asterisk/commit/9cff8e62fbd9e7db87c233de3335047df88877d0

https://github.com/asterisk/asterisk/commit/87399593cda601ae3670bf890bdb32f78e881bf3

https://github.com/asterisk/asterisk/commit/60c23d8b56b2cf93caceb527e07654b16f388343

https://github.com/asterisk/asterisk/commit/4b360a61d649a7c12b1021aa554642322ee28c10

https://github.com/asterisk/asterisk/commit/4373f8174bf71c467fc9db96036126d30425b9e8

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-110074

Details

Source: Mitre, NVD

Published: 2026-10-26

Updated: 2026-10-27

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 7.2

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Severity: High

CVSS v4

Base Score: 2.3

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

Severity: Low

EPSS

EPSS: 0.00767