How severe is CVE-2026-23738?

CVE-2026-23738 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-23738 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23738?

CVE-2026-23738 primarily affects Sangoma Asterisk. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-23738?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-23738 have an EU (EUVD) identifier?

Yes. CVE-2026-23738 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5645.

When was CVE-2026-23738 published?

CVE-2026-23738 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-23738

CVE-2026-23738 is a low-severity vulnerability in Sangoma Asterisk with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5645
Weakness: CWE-79
Affected product: Sangoma Asterisk
Published: 2026-02-06
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-23738?: 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.
How severe is CVE-2026-23738?: CVE-2026-23738 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-23738 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23738?: CVE-2026-23738 primarily affects Sangoma Asterisk. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-23738?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23738 have an EU (EUVD) identifier?: Yes. CVE-2026-23738 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5645.
When was CVE-2026-23738 published?: CVE-2026-23738 was published on 2026-02-06 and last updated on 2026-06-17.

References

https://github.com/asterisk/asterisk/security/advisories/GHSA-v6hp-wh3r-cwxh

Affected products (12)

cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:*:*:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert1:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert1-rc1:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert1-rc2:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert2:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert3:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert4:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert5:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert6:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert7:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:20.7:cert8:*:*:*:*:*:*

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