CVE-2026-72761Network attack vector

Authenticated SSRF via IPv6 transition address validation

Published Aug 10, 2026 · Updated Aug 10, 2026

SSRF in vulnerability-lookup unreleased HEAD code allows remote authenticated users to exfiltrate data through crafted webhook destinations. The webhook validator in website/notifications/webhooks.py accepts globally routed IPv6 transition addresses without checking whether their embedded IPv4 destination is private, loopback, link-local, or cloud metadata. Exploitation requires notification-configuration permission and a NAT64, 6to4, or Teredo path, allowing internal requests carrying vulnerability notification data.

CVSS severity6.9
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in vulnerability-lookup unreleased HEAD code allows remote authenticated users to exfiltrate data through crafted webhook destinations. The webhook validator in website/notifications/webhooks.py accepts globally routed IPv6 transition addresses without checking whether their embedded IPv4 destination is private, loopback, link-local, or cloud metadata. Exploitation requires notification-configuration permission and a NAT64, 6to4, or Teredo path, allowing internal requests carrying vulnerability notification data.

The record

CVE
CVE-2026-72761
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, CAPEC-664, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.9CIRCLCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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