Webhook-url-http-3a-2f-2f169.254.169.254-2fmetadata-2fidentity-2foauth2-2ftoken //free\\ < 360p >

The URL http://169.254.169 is a high-risk SSRF target allowing attackers to steal Azure Instance Metadata Service (IMDS) tokens, enabling unauthorized access to cloud resources. Remediation requires strict input validation, enforcing Metadata: True headers, and restricting network access to the 169.254.169.254 IP address.

The http://169.254.169.254/metadata/identity/oauth2/token webhook is the backbone of secure, credential-free authentication for Azure resources. By understanding its function as a local metadata service endpoint and ensuring strict adherence to security practices—specifically validating the Metadata:true header—developers can leverage managed identities to build highly secure applications. If you are configuring a system, Share public link

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Understanding http://169.254.169.254/metadata/identity/oauth2/token in Webhooks The URL http://169

– URL encoding bypasses simple string blacklists that look for 169.254.169.254 or metadata . Attackers can also use decimal, octal, or IPv6 representations (e.g., http://[::ffff:169.254.169.254]/ ).

If a hacker can force your application to make an arbitrary HTTP request, they can call http://169.254.169.254 and steal the identity token assigned to that VM.

: Attackers can probe internal network services that are not exposed to the public internet. Recommended Safety Features By understanding its function as a local metadata

| Encoded | Decoded | |---------|---------| | http-3A-2F-2F | http:// | | 169.254.169.254 | (unchanged) | | -2Fmetadata-2Fidentity-2Foauth2-2Ftoken | /metadata/identity/oauth2/token |

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: Use a webhook secret to verify that the outgoing request is legitimate. Attackers can also use decimal, octal, or IPv6

By understanding the anatomy of this attack – from the percent-encoded %3A to the final OAuth2 token – you can build robust defenses and keep your cloud infrastructure secure.

Since SSRF originates from within the server, it can reach endpoints protected by perimeter firewalls. This effectively turns the ... Resecurity Azure SSRF with Workflow Designer Feature