How severe is CVE-2026-28209?

CVE-2026-28209 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-28209 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28209?

CVE-2026-28209 affects Sangoma Freepbx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28209?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-28209 have an EU (EUVD) identifier?

Yes. CVE-2026-28209 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9856.

When was CVE-2026-28209 published?

CVE-2026-28209 was published on 2026-03-05 and last updated on 2026-06-17.

CVE-2026-28209

CVE-2026-28209 is a high-severity vulnerability in Sangoma Freepbx with a CVSS 3.x base score of 7.2. 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-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 7.5
EPSS exploit prediction: 1% (73rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9856
Weakness: CWE-78
Affected product: Sangoma Freepbx
Published: 2026-03-05
Last modified: 2026-06-17

Description

FreePBX is an open source IP PBX. From versions 16.0.17.2 to before 16.0.20 and from version 17.0.2.4 to before 17.0.5, a command injection vulnerability exists in FreePBX when using the ElevenLabs Text-to-Speech (TTS) engine in the recordings module. This issue has been patched in versions 16.0.20 and 17.0.5.

Frequently asked questions

What is CVE-2026-28209?: FreePBX is an open source IP PBX. From versions 16.0.17.2 to before 16.0.20 and from version 17.0.2.4 to before 17.0.5, a command injection vulnerability exists in FreePBX when using the ElevenLabs Text-to-Speech (TTS) engine in the recordings module. This issue has been patched in versions 16.0.20 and 17.0.5.
How severe is CVE-2026-28209?: CVE-2026-28209 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-28209 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28209?: CVE-2026-28209 affects Sangoma Freepbx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28209?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-28209 have an EU (EUVD) identifier?: Yes. CVE-2026-28209 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9856.
When was CVE-2026-28209 published?: CVE-2026-28209 was published on 2026-03-05 and last updated on 2026-06-17.

References

https://github.com/FreePBX/security-reporting/security/advisories/GHSA-f558-mp87-58vj

Affected products (1)

cpe:2.3:a:sangoma:freepbx:*:*:*:*:*:*:*:*

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