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Vulnerability details: VCID-ytty-tbs1-ffc7
Vulnerability ID VCID-ytty-tbs1-ffc7
Aliases CVE-2026-23738
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 3.1
Risk 1.6
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-23738
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-23738
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-23738
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-23738
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-23738
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-23738
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-23738
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2026-23738
cvssv3.1 3.5 https://github.com/asterisk/asterisk/security/advisories/GHSA-v6hp-wh3r-cwxh
ssvc Track https://github.com/asterisk/asterisk/security/advisories/GHSA-v6hp-wh3r-cwxh
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-23738
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-23738
1127438 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1127438
GHSA-v6hp-wh3r-cwxh https://github.com/asterisk/asterisk/security/advisories/GHSA-v6hp-wh3r-cwxh
No exploits are available.
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N Found at https://github.com/asterisk/asterisk/security/advisories/GHSA-v6hp-wh3r-cwxh
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-06T17:43:40Z/ Found at https://github.com/asterisk/asterisk/security/advisories/GHSA-v6hp-wh3r-cwxh
Exploit Prediction Scoring System (EPSS)
Percentile 0.13683
EPSS Score 0.00044
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T16:39:23.916970+00:00 Debian Oval Importer Import https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2 38.0.0