CVE-2026-23738
February 06, 2026
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, user supplied/control values for Cookies and any GET variable query Parameter are directly interpolated into the HTML of the page using ast_str_append. The endpoint at GET /httpstatus is the potential vulnerable endpoint relating to asterisk/main /http.c. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
Affected Packages
https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=20.8.0 <20.18.2Fix Suggestion:
Update to version 20.18.2https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=certified-20.7-cert1 <certified-20.7-cert9Fix Suggestion:
Update to version certified-20.7-cert9https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=21.0.0 <21.12.1Fix Suggestion:
Update to version 21.12.1https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=23.0.0 <23.2.2Fix Suggestion:
Update to version 23.2.2https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=22.0.0 <22.8.2Fix Suggestion:
Update to version 22.8.2Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.1
Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.5
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.03
