Cross-site scripting in Asterisk Open Source and Certified Asterisk - CVE-2026-57196
Published: June 26, 2026
Vulnerability identifier: #VU135547
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-57196
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Digium (Linux Support Services)
Affected software:
Asterisk Open Source
Certified Asterisk
Asterisk Open Source
Certified Asterisk
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary script in the victim's browser and impersonate an authorized user.
The vulnerability exists due to cross-site scripting in Phone Provisioning HTTP error pages when handling crafted HTTP requests. A remote attacker can send a malicious link to a victim to execute arbitrary script in the victim's browser and impersonate an authorized user.
User interaction is required, and exploitation is possible only when the res_phoneprov module is enabled and the HTTP server and AMI over HTTP are enabled.
How to mitigate CVE-2026-57196
Install security update from vendor's website.