CVE-2026-23738

Reflected XSS via unencoded status-page inputs

Published Feb 6, 2026 · Updated Feb 6, 2026

Reflected XSS in Sangoma Asterisk before 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2 allows remote attackers to run scripts. The /httpstatus handler in main/http.c appends GET parameter names and values and Cookie names and values into HTML with ast_str_append without HTML encoding. Exploitation requires an enabled, reachable HTTP server and a user to open an attacker-crafted status-page URL; script executes in that page's browser context and can expose accessible data.

CVSS severity3.5
Low
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Sangoma Asterisk before 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2 allows remote attackers to run scripts. The /httpstatus handler in main/http.c appends GET parameter names and values and Cookie names and values into HTML with ast_str_append without HTML encoding. Exploitation requires an enabled, reachable HTTP server and a user to open an attacker-crafted status-page URL; script executes in that page's browser context and can expose accessible data.

The record

CVE
CVE-2026-23738
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Asterisk
Product
Asterisk
Classifications
CWE-79, T1189
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 20.18.2
  2. Affected versionversion=< 20.7-cert9
  3. Affected versionversion=< 21.12.1
  4. Affected versionversion=< 22.8.2
  5. Affected versionversion=< 23.2.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Asterisk · Asteriskversion=< 20.18.2; version=< 20.7-cert9; version=< 21.12.1; version=< 22.8.2; version=< 23.2.2

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.5GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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