Web Authn CBOR Decoder
Summary: PortSwigger lists WebAuthn CBOR, a Burp Suite extension by Srikanth Ramu at version 1.0, as a tool to decode the CBOR format used in WebAuthn, the W3C standard for strong user authentication that relies on Base64url encoding, CBOR, and COSE. The listing was last updated 09 December 2022, carries an overall system impact rating of Low, and is distributed through the BApp Store with a note that third-party extensions come with no warranty from PortSwigger.
Key Takeaway: WebAuthn underpins strong authentication, and its CBOR and COSE payloads are binary - so testing them by hand means decoding a format most web testers never touch, which is why a dedicated decoder exists as a third-party extension PortSwigger explicitly does not warrant.
Read the original at PortSwigger Research ↗
- Topics
- Vulnerabilities & Patching
- Related
- Attackers Exploit UnrealIRCd Flaw That Enables Server-Level Command Injection Cyber Risks · Nov 14, 2026U.S. CISA adds Check Point and UnrealIRCd flaws to its Known Exploited Vulnerabilities catalog Cyber Risks · Nov 14, 2026PostgreSQL Patches 52 Flaws, Including 22-Year-Old Bug Enabling Authenticated RCE Cyber Risks · Nov 13, 2026