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TI-2026-50987 Aliases CVE-2026-72761

Server-side request forgery in vulnerability-lookup

Priority LOW 37CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

The webhook URL validator in `website/notifications/webhooks.py` uses `ip.is_global` to reject non-public addresses after DNS resolution. IPv6 transition addresses (NAT64 `64:ff9b::/96`, 6to4 `2002::/16`, Teredo `2001:0000::/32`) are classified as globally routable by IANA, so `is_global` returns `True` even when the embedded IPv4 targets a private, loopback, or cloud metadata destination. An attacker can register a webhook pointing at a hostname that resolves to a transition address to bypass the SSRF guard and exfiltrate vulnerability data to an internal endpoint. The vulnerability was introduced on a non-release version. The fix was already done on HEAD. It only affects organisation running the HEAD.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00468 40th percentileScored 2026-11-07
Fix Fixed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

No affected products listed by the sources yet.

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-72761

References

Patch 1

  • TI-2026-51549 Reusable Account Activation and Recovery Tokens Allow Repeated Account Takeover in vulnerability-lookup CVSS 4.0HIGH 8.8
  • TI-2026-51493 Stored Cross-Site Scripting (XSS) via Unescaped CNA Reference Tags in vulnerability-lookup CVSS 4.0MEDIUM 6.1
  • TI-2026-65074 Vulnerability-Lookup - Race Condition in Account Recovery Token Consumption Allows Password Takeover CVSS 4.0MEDIUM 6.3
  • TI-2026-51523 Authorization Bypass in SSE Pub/Sub Allows Unconfirmed Accounts to Access Stream Events in vulnerability-lookup CVSS 4.0MEDIUM 5.3
  • TI-2026-85793 Memory amplification in Vulnerability-Lookup webhook templates CVSS 4.0MEDIUM 5.3
  • TI-2026-51550 Server-side request forgery in vulnerability-lookup CVSS 4.0MEDIUM 5.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences