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PatchSiren cyber security CVE debrief

CVE-2019-19006 Sangoma CVE debrief

CVE-2019-19006 is a Sangoma FreePBX improper authentication vulnerability that CISA added to the Known Exploited Vulnerabilities (KEV) catalog on 2026-02-03. The available source corpus does not provide detailed exploit mechanics, but it does confirm this issue is considered known exploited and that remediation should follow vendor guidance. CISA’s KEV entry also points to a Sangoma/FreePBX vendor note titled "Remote Admin Authentication Bypass," indicating the authentication boundary is the primary concern.

Vendor
Sangoma
Product
FreePBX
CVSS
CRITICAL 9.8
CISA KEV
Listed
Original CVE published
2026-02-03
Original CVE updated
2026-02-03
Advisory published
2026-02-03
Advisory updated
2026-02-03

Who should care

Administrators and security teams responsible for Sangoma FreePBX deployments should treat this as a priority issue, especially any environment that exposes FreePBX administration or related management interfaces. Asset owners should also care because CISA has designated it as known exploited, which raises urgency for validation, mitigation, and replacement planning if remediation is not immediately available.

Technical summary

The source material identifies the vulnerability as an improper authentication issue in Sangoma FreePBX. CISA classifies it as known exploited and references a vendor document associated with remote admin authentication bypass. No CVSS score or detailed root-cause writeup is provided in the supplied corpus, so the safest interpretation is that authentication controls in FreePBX should be assumed insufficient until patched or otherwise mitigated according to vendor instructions.

Defensive priority

High. CISA KEV inclusion means defenders should prioritize this over non-exploited issues, confirm whether FreePBX is present, and act by the due date supplied in the KEV metadata (2026-02-24). If mitigations cannot be applied, CISA advises discontinuing use of the product.

Recommended defensive actions

  • Inventory all Sangoma FreePBX instances and confirm whether any are exposed to untrusted networks.
  • Apply vendor-recommended mitigations or updates as directed by Sangoma/FreePBX guidance.
  • Follow CISA KEV remediation expectations and complete action by 2026-02-24 where feasible.
  • Review administrative access paths and restrict them to trusted management networks and strong authentication controls.
  • If a supported mitigation is unavailable, plan for service discontinuation or replacement as CISA advises.
  • Validate remediation by confirming the affected FreePBX systems are no longer exposed to the vulnerable condition.

Evidence notes

This debrief is limited to the supplied source corpus and official links. The strongest evidence is the CISA KEV entry, which names the issue, marks it as known exploited, and supplies a remediation due date. The corpus also includes the NVD and CVE.org records as official references, but no additional technical detail or severity score was supplied. Timeline context is taken from the provided CVE and KEV fields, with CISA dateAdded 2026-02-03 and dueDate 2026-02-24.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-19006 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-19006

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2019-19006 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-19006

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.