CVE-2026-57196 Asterisk: Reflected XSS in Phone Provisioning HTTP Error Pages
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-57196?
CVE-2026-57196 is a low-severity vulnerability in asterisk, published on 26 Oct 2026.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-57196?
How do I fix CVE-2026-57196?
Upgrade to a fixed version.
Is CVE-2026-57196 being exploited?
There is no known exploitation of CVE-2026-57196 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-57196, GHSA-4pgv-j3mr-3rcp, UBUNTU-CVE-2026-57196.