PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-79671 lin-snow CVE debrief

CVE-2026-79671 is a server-side request forgery (SSRF) vulnerability in Ech0 before version 4.4.3. The vulnerability exists in the validateWebhookURL function, which fails to properly validate hostnames that DNS-resolve to private or internal IPs. An attacker with admin privileges can exploit this by creating a webhook with a malicious hostname, potentially leading to unauthorized requests to internal services, cloud metadata endpoints, and private network resources. Ech0 server administrators should be aware of this vulnerability and take necessary actions to mitigate the risk. The issue is fixed in version 4.4.3. Evidence is based on limited source detail, including the CVE description and a few references. Additional verification is recommended to confirm affected scope and severity.

Vendor
lin-snow
Product
Ech0
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-25
Original CVE updated
2026-08-29
Advisory published
2026-08-25
Advisory updated
2026-08-29

Who should care

Ech0 server administrators, security teams, and organizations using Ech0 versions prior to 4.4.3 should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The validateWebhookURL function in Ech0 before 4.4.3 is vulnerable to server-side request forgery (SSRF). The function only validates literal IP addresses and fails to reject hostnames that DNS-resolve to private or internal IPs. An attacker with admin privileges can exploit this by creating a webhook with a malicious hostname, potentially leading to unauthorized requests to internal services, cloud metadata endpoints, and private network resources.

Defensive priority

CVE-2026-79671 is rated MEDIUM with a CVSS score of 5.1, indicating a moderate vulnerability. Ech0 server administrators should prioritize patching to prevent potential SSRF attacks.

Recommended defensive actions

  • Apply the patch to upgrade Ech0 to version 4.4.3 or later.
  • Restrict webhook creation to trusted administrators.
  • Monitor server requests for suspicious activity.
  • Consider implementing additional security controls for webhook validation.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE-2026-79671 vulnerability in Ech0 before 4.4.3 allows an attacker with admin privileges to create a webhook with a hostname that DNS-resolves to private or internal IPs, bypassing validation and potentially causing the server to make requests to internal services, cloud metadata endpoints, and private network resources. The issue is fixed in version 4.4.3. Evidence is based on limited source detail, including the CVE description and a few references.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-79671 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-79671

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

  • CVE-2026-79671 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-79671

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

Supplemental references

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.