GMS-2015-4: JWT Verification bypass with "none" algorithm

March 31, 2015

It is possible for an attacker to create his own signed token with any payload he wants and have it considered valid using the “none” algorithm.

References

auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/
github.com/auth0/node-jsonwebtoken/commit/1bb584bc382295eeb7ee8c4452a673a77a68b687
www.timmclean.net/2015/02/25/jwt-alg-none.html

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