CVE-2026-86735

snipe-it versions before 8.7.0 contain a server-side request forgery vulnerability in the ExternalUrl validation rule that fails to detect IPv6 transition addresses encoding private IPv4 targets. Attackers with super-admin privileges can configure webhook URLs using NAT64, 6to4, or Teredo transition addresses to bypass SSRF guards and access internal services or cloud metadata endpoints.

• CWE-918

• https://github.com/grokability/snipe-it/security/advisories/GHSA-5j6m-rr83-rpj7Vendor Advisory, Mitigation
• https://www.vulncheck.com/advisories/snipe-it-before-8.7.0-ssrf-via-ipv6-transition-address-bypassThird Party Advisory

Published

Sep 8, 2026

Last Modified

Sep 9, 2026

Status

Analyzed

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